Patent US3972471A successfully refreshed from Google Patents.
US3972471A
Expired / Lapsed
US
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Automatic temperature setback system for controlling a heating unit
Assignee: Individual
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Filing: 1975-05-27
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Granted: 1976-08-03
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Expires: 1995-05-27
Abstract
Abstract An automatic temperature setback system for controlling a heating unit includes the use of two devices. One device includes a oscillator circuit which is actuated by a timer control. The oscillator circuit can be an astable or free-running multivibrator. The output from such device is coupled across the low voltage secondary transformer winding of a typical heating system control unit so that, at specific timed intervals, the low voltage (i.e., 24 volts RMS) can have high frequency modulations superimposed upon either the positive cycles of such voltage or alternatively the negative cycles or alternatively both cycles. Such one device could be termed, in general, means for half-wave modulating the low alternating voltage carrier from a typical heating system control unit. The low voltage wires from the typical heating system control unit, in a conventional household, are coupled through the house to a low voltage thermostat located in one of the rooms of the house. The second device of the system includes a module, herein termed a thermostat module, which is activated by the modulation in the low voltage wires which are coupled to the thermostat. The thermostat module provides an output across a heating resistor which is placed in proximity to the low voltage thermostat to influence the thermostat when the first named device is operative. The second device can generally be termed a means for demodulating such modulation to provide current to flow through a heating resistor which is in proximity to the thermostat. The second device can include a separate switch for deactivating or activating such module, wherein such switch is coupled to one of the low voltage leads. The opposite end of the switch is coupled through the heating resistor and through a variable potentiometer to the anode of a silicon controlled rectifier (SCR). The cathode of the SCR is coupled to the other lead of the low voltage supply. A capacitor is coupled across the anode and the gate electrode of the SCR. A resistor couples the gate electrode and the cathode of the SCR. The capacitor is of such a value as to be of low impedance to the modulated signal. Desirably, a serial connected resistor and a light emitting diode are coupled between the switch and the anode of the SCR so that, when the second device is operative the light emitting diode glows to indicate that the thermostat module is functioning.
Inventors
- 👤 Ronald N. Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:46
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/30; G05D23/32; G05D23/1902; G05D23/1904
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
230 words
A temperature setback controlling system suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature, wherein heating controls for said system including a transformer having a secondary winding for providing low voltage, 60 Hz power are located in a second room of said building, and wherein a thermostat cable coupling said thermostat in said first room to said heating controls in said second room is located at least partially within interior walls of said building, said temperature setback controlling system comprising timed control means, adapted to be coupled to said transformer winding, for modulating during selected time periods cycles of one polarity of said 60 Hz low voltage with a high frequency; a resistive heater, adapted to be placed in proximity to said room temperature sensing element; and detector means, adapted to be coupled to said thermostat cable in said first room, for detecting said high frequency modulation during cycles of said one polarity and coupled to said resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said first room tends to be maintained at a predetermined temperature setback during said selected time periods.
Claim 2
Dependent Claim
230 words
A temperature setback controlling system suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature, wherein heating controls for said system including a transformer having a secondary winding for providing low voltage, 60 Hz power are located in a second room of said building, and wherein a thermostat cable coupling said thermostat in said first room to said heating controls in said second room is located at least partially within interior walls of said building, said temperature setback controlling system comprising timed control means, adapted to be coupled to said transformer winding, for modulating during selected time periods cycles of one polarity of said 60 Hz low voltage with a high frequency; a resistive heater, adapted to be placed in proximity to said room temperature sensing element; and detector means, adapted to be coupled to said thermostat cable in said first room, for detecting said high frequency modulation during cycles of said one polarity and coupled to said resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said first room tends to be maintained at a predetermined temperature setback during said selected time periods.
Claim 3
Dependent Claim
80 words
The temperature setback controlling system as recited in claim 1 wherein said timed control means comprises a switch; an electrical timer coupled to said switch so that said switch is closed during selected time periods and is opened during non-selected time periods; an electronic oscillator circuit; unilateral conducting means; and means coupling said switch, said oscillator circuit, and said unilateral conducting means in a serial circuit whereby said serial circuit is adapted to be coupled to said transformer secondary winding.
Claim 4
Dependent Claim
34 words
The temperature setback controlling system as recited in claim 2 wherein said electronic oscillator circuit comprises a multivibrator having an output terminal; and an amplifier having an input terminal coupled to said output terminal.
Claim 5
Dependent Claim
156 words
The temperature setback controlling system as recited in claim 2 wherein said detector means comprises a manual switch having a pair of terminals, one terminal of said manual switch being adapted to be coupled to said thermostat cable, the other terminal being coupled to a first junction point; a silicon controlled rectifier having an anode, a cathode, and a gate electrode, said cathode being adapted to be coupled to said thermostat cable; a serially connected resistor and a light emitting diode serially coupling said first junction point to said anode, said diode being oriented so that its direction of conductivity is in the same direction as said rectifier; a capacitor coupled across said anode and said gate electrode; a second resistor coupled across said cathode and said gate electrode; a variable potentiometer coupling a second junction point to said anode of said silicon controlled rectifier; and means for coupling said junction points to said resistive heater.
Claim 6
Dependent Claim
156 words
The temperature setback controlling system as recited in claim 1 wherein said detector means comprises a manual switch having a pair of terminals, one terminal of said manual switch being adapted to be coupled to said thermostat cable, the other terminal being coupled to a first junction point; a silicon controlled rectifier having an anode, a cathode, and a gate electrode, said cathode being adapted to be coupled to said thermostat cable; a serially connected resistor and a light emitting diode serially coupling said first junction point to said anode, said diode being oriented so that its direction of conductivity is in the same direction as said rectifier; a capacitor coupled across said anode and said gate electrode; a second resistor coupled across said cathode and said gate electrode; a variable potentiometer coupling a second junction point to said anode of said silicon controlled rectifier; and means for coupling said junction points to said resistive heater.
Claim 7
Dependent Claim
342 words
A temperature setback controlling system suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature, wherein heating controls for said heating system including a transformer having a secondary winding for providing low voltage, 60 Hz, power are located in a second room of said building, and wherein a thermostat cable coupling said thermostat in said first room to said heating controls in said second room is located at least partially within interior walls of said building, said temperature setback controlling system comprising timed control means, adapted to be coupled to said transformer winding, for modulating during one set of selected time periods cycles of positive polarity of said 60 Hz low voltage with a high frequency, and for modulating during a second set of selected time periods cycles of negative polarity of said 60 Hz low voltage with a high frequency; a first resistive heater and a second resistive heater, each adapted to be placed in proximity to said room temperature sensing element; and detector means, adapted to be coupled to said thermostat cable in said first room, for detecting said high frequency modulatings and coupled to said resistive heaters for providing current flow to said first heater in response to detected modulation during cycles of said positive polarity and for providing current flow to said second heater in response to detected modulation during cycles of said negative polarity, whereby the ambient temperature in said first room tends to be maintained at a first predetermined temperature setback during said one set of selected time periods and at a second predetermined temperature setback during said second set of selected time periods, and, whereby, during those intervals when said one set and said second set of time periods overlap, the ambient room temperature in said first room tends to be maintained at a third predetermined temperature setback.
Claim 8
Dependent Claim
342 words
A temperature setback controlling system suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature, wherein heating controls for said heating system including a transformer having a secondary winding for providing low voltage, 60 Hz, power are located in a second room of said building, and wherein a thermostat cable coupling said thermostat in said first room to said heating controls in said second room is located at least partially within interior walls of said building, said temperature setback controlling system comprising timed control means, adapted to be coupled to said transformer winding, for modulating during one set of selected time periods cycles of positive polarity of said 60 Hz low voltage with a high frequency, and for modulating during a second set of selected time periods cycles of negative polarity of said 60 Hz low voltage with a high frequency; a first resistive heater and a second resistive heater, each adapted to be placed in proximity to said room temperature sensing element; and detector means, adapted to be coupled to said thermostat cable in said first room, for detecting said high frequency modulatings and coupled to said resistive heaters for providing current flow to said first heater in response to detected modulation during cycles of said positive polarity and for providing current flow to said second heater in response to detected modulation during cycles of said negative polarity, whereby the ambient temperature in said first room tends to be maintained at a first predetermined temperature setback during said one set of selected time periods and at a second predetermined temperature setback during said second set of selected time periods, and, whereby, during those intervals when said one set and said second set of time periods overlap, the ambient room temperature in said first room tends to be maintained at a third predetermined temperature setback.
Claim 9
Dependent Claim
155 words
The temperature setback controlling system as recited in claim 6 wherein said timed control means comprises a first switch; a second switch; electrical timing means coupled to said switches so that said first switch is closed during said one set of selected time periods and is otherwise normally opened, and so that said second switch is closed during said second set of selected time periods and is otherwise normally opened; a first electronic oscillator circuit; first unilateral conducting means; a second electronic oscillator circuit; second unilateral conducting means; means coupling said first switch, said first oscillator circuit, and said first unilateral conducting means in a first serial circuit; means coupling said second switch, said second oscillator circuit, and said second unilateral conducting means in a second serial circuit; and means for coupling said serial circuits in an opposing shunt relation whereby the resulting shunt circuit is adapted to be coupled to said transformer secondary winding.
Claim 10
Dependent Claim
38 words
The temperature setback controlling system as recited in claim 7 wherein at least one of said electronic oscillator circuits comprises a multivibrator having an output terminal; and an amplifier having an input terminal coupled to said output terminal.
Claim 11
Dependent Claim
267 words
The temperature setback controlling system as recited in claim 7 wherein said detector means comprises a first silicon controlled rectifier having an anode, a cathode, and a gate electrode; a second silicon controlled rectifier having an anode, a cathode, and a gate electrode; a first serially connected resistor and a first light emitting diode serially coupled to said anode of said first silicon controlled rectifier; a second serially connected resistor and a second light emitting diode serially coupled to said anode of said second silicon controlled rectifier; a first capacitor coupled across said first anode and said first gate electrode; a second capacitor coupled across second anode and said second gate electrode; a third resistor coupled across said first cathode and said first gate electrode; a fourth resistor coupled across said second cathode and said second gate electrode; a first variable potentiometer having a first terminal, and having a second terminal coupled to said first anode; a second variable potentiometer having a first terminal, and having a second terminal coupled to said second anode; means for coupling said first terminal of said first potentiometer, and said second cathode, to said first resistive heater; means for coupling said first terminal of said second potentiometer, and said first cathode, to said second resistive heater; a pair of leads adapted to be coupled to said thermostat cable; means for coupling said first resistor and said second cathode to a first of said leads; means for coupling said second resistor and said first cathode to a second of said leads; and a manual switch in circuit with one of said leads.
Claim 12
Dependent Claim
267 words
The temperature setback controlling system as recited in claim 6 wherein said detector means comprises a first silicon controlled rectifier having an anode, a cathode, and a gate electrode; a second silicon controlled rectifier having an anode, a cathode, and a gate electrode; a first serially connected resistor and a first light emitting diode serially coupled to said anode of said first silicon controlled rectifier; a second serially connected resistor and a second light emitting diode serially coupled to said anode of said second silicon controlled rectifier; a first capacitor coupled across said first anode and said first gate electrode; a second capacitor coupled across second anode and said second gate electrode; a third resistor coupled across said first cathode and said first gate electrode; a fourth resistor coupled across said second cathode and said second gate electrode; a first variable potentiometer having a first terminal, and having a second terminal coupled to said first anode; a second variable potentiometer having a first terminal, and having a second terminal coupled to said second anode; means for coupling said first terminal of said first potentiometer, and said second cathode, to said first resistive heater; means for coupling said first terminal of said second potentiometer, and said first cathode, to said second resistive heater; a pair of leads adapted to be coupled to said thermostat cable; means for coupling said first resistor and said second cathode to a first of said leads; means for coupling said second resistor and said first cathode to a second of said leads; and a manual switch in circuit with one of said leads.
Claim 13
Dependent Claim
361 words
A temperature setback controlling system suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature in said first room, wherein another thermostat having a room temperature sensing element is employed on a wall in a second room to sense room temperature for control of said heating system effective in said second room to maintain a thermostat selected ambient room temperature in said second room, wherein heating controls for said heating system including a transformer having a secondary winding for providing low voltage, 60 Hz, power are located in a third room of said building, and wherein thermostat cables coupling said thermostats to said heating controls are located at least partially within interior walls of said building, said temperature setback controlling system comprising timed control means, adapted to be coupled to said transformer winding, for modulating during selected time periods cycles of one polarity of said 60 Hz low voltage with a high frequency; a first resistive heater, adapted to be placed in proximity to said first room, room temperature sensing element; a second resistive heater, adapted to be placed in proximity to said second room, room temperature sensing element; first detector means, adapted to be coupled to said thermostat cable in said first room, for detecting said high frequency modulation during cycles of said one polarity and coupled to said first resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said first room tends to be maintained at a predetermined temperature setback during said selected time periods; and second detector means, adapted to be coupled to said thermostat cable in said second room, for detecting said high frequency modulation during cycles of said one polarity and coupled to said second resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said second room tends to be maintained at a predetermined temperature setback during said selected time periods.
Claim 14
Dependent Claim
361 words
A temperature setback controlling system suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature in said first room, wherein another thermostat having a room temperature sensing element is employed on a wall in a second room to sense room temperature for control of said heating system effective in said second room to maintain a thermostat selected ambient room temperature in said second room, wherein heating controls for said heating system including a transformer having a secondary winding for providing low voltage, 60 Hz, power are located in a third room of said building, and wherein thermostat cables coupling said thermostats to said heating controls are located at least partially within interior walls of said building, said temperature setback controlling system comprising timed control means, adapted to be coupled to said transformer winding, for modulating during selected time periods cycles of one polarity of said 60 Hz low voltage with a high frequency; a first resistive heater, adapted to be placed in proximity to said first room, room temperature sensing element; a second resistive heater, adapted to be placed in proximity to said second room, room temperature sensing element; first detector means, adapted to be coupled to said thermostat cable in said first room, for detecting said high frequency modulation during cycles of said one polarity and coupled to said first resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said first room tends to be maintained at a predetermined temperature setback during said selected time periods; and second detector means, adapted to be coupled to said thermostat cable in said second room, for detecting said high frequency modulation during cycles of said one polarity and coupled to said second resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said second room tends to be maintained at a predetermined temperature setback during said selected time periods.
Claim 15
Dependent Claim
81 words
The temperature setback controlling system as recited in claim 11 wherein said timed control means comprises a switch; an electrical timer coupled to said switch so that said switch is closed during said selected time periods and is opened during non-selected time periods; an electronic oscillator circuit; unilateral conducting means; and means coupling said switch, said oscillator circuit, and said unilateral conducting means in a serial circuit whereby said serial circuit is adapted to be coupled to said transformer secondary winding.
Claim 16
Dependent Claim
34 words
The temperature setback controlling system as recited in claim 12 wherein said electronic oscillator circuit comprises a multivibrator having an output terminal; and an amplifier having an input terminal coupled to said output terminal.
Claim 17
Dependent Claim
158 words
The temperature setback controlling system as recited in claim 12 wherein one of said detector means comprises a manual switch having a pair of terminals, one terminal of said manual switch being adapted to be coupled to said thermostat cable, the other terminal being coupled to a first junction point; a silicon controlled rectifier having an anode, a cathode, and a gate electrode, said cathode being adapted to be coupled to said thermostat cable; a serially connected resistor and a light emitting diode serially coupling said first junction point to said anode, said diode being poled so that its direction of conductivity is in the same direction as said rectifier; a capacitor coupled across said anode and said gate electrode; a second resistor coupled across said cathode and said gate electrode; a variable potentiometer coupling a second junction point to said anode of said silicon controlled rectifier; and means for coupling said junction points to said resistive heater.
Claim 18
Dependent Claim
158 words
The temperature setback controlling system as recited in claim 11 wherein one of said detector means commprises a manual switch having a pair of terminals, one terminal of said manual switch being adapted to be coupled to said thermostat cable, the other terminal being coupled to a first junction point; a silicon controlled rectifier having an anode, a cathode, and a gate electrode, said cathode being adapted to be coupled to said thermostat cable; a serially connected resistor and a light emitting diode serially coupling said first junction point to said anode, said diode being poled so that its direction of conductivity is in the same direction as said rectifier; a capacitor coupled across said anode and said gate electrode; a second resistor coupled across said cathode and said gate electrode; a variable potentiometer coupling a second junction point to said anode of said silicon controlled rectifier; and means for coupling said junction points to said resistive heater.
Claim 19
Dependent Claim
395 words
A temperature setback controlling system suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature in said first room, wherein another thermostat having a room temperature sensing element is employed on a wall in a second room to sense room temperature for control of said heating system effective in said second room to maintain a thermostat selected ambient room temperature in said second room, wherein heating controls for said heating system including a transformer having a secondary winding for providing low voltage 60 Hz power are located in a third room of said building, and wherein thermostat cables coupling said thermostats to said heating controls are located at least partially within interior walls of said building, said temperature setback controlling system comprising timed control means, adapted to be coupled to said transformer winding, for modulating during one set of selected time periods cycles of positive polarity of said 60 Hz low voltage with a high frequency, and for modulating during a second set of selected time periods cycles of negative polarity of said 60 Hz low voltage with a high frequency; a first resistive heater, adapted to be placed in proximity to said first room, room temperature sensing element; a second resistive heater, adapted to be placed in proximity to said second room, room temperature sensing element; first detector means, adapted to be coupled to said thermostat cable in said first room, for detecting said high frequency modulation during cycles of said positive polarity and coupled to said first resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said first room tends to be maintained at a predetermined temperature setback during said one set of selected time periods; and second detector means, adapted to be coupled to said thermostat cable in said second room, for detecting said high frequency modulation during cycles of said negative polarity and coupled to said second resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said second room tends to be maintained at a predetermined temperature setback during said second set of selected time periods.
Claim 20
Dependent Claim
395 words
A temperature setback controlling system suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature in said first room, wherein another thermostat having a room temperature sensing element is employed on a wall in a second room to sense room temperature for control of said heating system effective in said second room to maintain a thermostat selected ambient room temperature in said second room, wherein heating controls for said heating system including a transformer having a secondary winding for providing low voltage 60 Hz power are located in a third room of said building, and wherein thermostat cables coupling said thermostats to said heating controls are located at least partially within interior walls of said building, said temperature setback controlling system comprising timed control means, adapted to be coupled to said transformer winding, for modulating during one set of selected time periods cycles of positive polarity of said 60 Hz low voltage with a high frequency, and for modulating during a second set of selected time periods cycles of negative polarity of said 60 Hz low voltage with a high frequency; a first resistive heater, adapted to be placed in proximity to said first room, room temperature sensing element; a second resistive heater, adapted to be placed in proximity to said second room, room temperature sensing element; first detector means, adapted to be coupled to said thermostat cable in said first room, for detecting said high frequency modulation during cycles of said positive polarity and coupled to said first resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said first room tends to be maintained at a predetermined temperature setback during said one set of selected time periods; and second detector means, adapted to be coupled to said thermostat cable in said second room, for detecting said high frequency modulation during cycles of said negative polarity and coupled to said second resistive heater for providing current flow thereto in response to such detected modulation, whereby the ambient temperature in said second room tends to be maintained at a predetermined temperature setback during said second set of selected time periods.
Claim 21
Dependent Claim
155 words
The temperature setback controlling system as recited in claim 16 wherein said timed control means comprises a first switch; a second switch; electrical timing means coupled to said switches so that said first switch is closed during said one set of selected time periods and is otherwise normally opened, and so that said second switch is closed during said second set of selected time periods and is otherwise normally opened; a first electronic oscillator circuit; first unilateral conducting means; a second electronic oscillator circuit; second unilateral conducting means; means coupling said first switch, said first oscillator circuit, and said first unilateral conducting means in a first serial circuit; means coupling said second switch, and second oscillator circuit, and said second unilateral conducting means in a second serial circuit; and means for coupling said serial circuits in an opposing shunt relation whereby the resulting shunt circuit is adapted to be coupled to said transformer secondary winding.
Claim 22
Dependent Claim
38 words
The temperature setback controlling system as recited in claim 17 wherein at least one of said electronic oscillator circuits comprises a multivibrator having an output terminal; and an amplifier having an input terminal coupled to said output terminal.
Claim 23
Dependent Claim
97 words
In combination, a resistive heater, adapted to be placed in proximity to a room temperature sensing element of a thermostat employed in a wall of a room; and detector means, adapted to be coupled to a thermostat cable which engages with said thermostat, for detecting high frequency modulation during cycles of one polarity on said cable, and coupled to said resistive heater for providing current flow thereto in response to such detected modulation; whereby the ambient room temperature in said room tends to be maintained at a predetermined temperature setback during time periods of such detected modulation.
Claim 24
Dependent Claim
97 words
In combination, a resistive heater, adapted to be placed in proximity to a room temperature sensing element of a thermostat employed in a wall of a room; and detector means, adapted to be coupled to a thermostat cable which engages with said thermostat, for detecting high frequency modulation during cycles of one polarity on said cable, and coupled to said resistive heater for providing current flow thereto in response to such detected modulation; whereby the ambient room temperature in said room tends to be maintained at a predetermined temperature setback during time periods of such detected modulation.
Claim 25
Independent Claim
163 words
A method of temperature setback control suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature, wherein heating controls for said system including a transformer having a secondary winding for providing low voltage, 60 Hz, power are located in a second room of said building, and wherein a thermostat cable coupling said thermostat in said first room to said heating controls in said second room is located at least partially within interior walls of said building, said method comprising modulating cycles of one polarity of said low 60 Hz voltage with a high frequency during selected time periods; detecting, at said thermostat cable in said first room, said high frequency modulation; and applying heat to said room temperature sensing element in response to such detected modulation.
Claim 26
Independent Claim
163 words
A method of temperature setback control suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature, wherein heating controls for said system including a transformer having a secondary winding for providing low voltage, 60 Hz, power are located in a second room of said building, and wherein a thermostat cable coupling said thermostat in said first room to said heating controls in said second room is located at least partially within interior walls of said building, said method comprising modulating cycles of one polarity of said low 60 Hz voltage with a high frequency during selected time periods; detecting, at said thermostat cable in said first room, said high frequency modulation; and applying heat to said room temperature sensing element in response to such detected modulation.
Claim 27
Independent Claim
276 words
A method of temperature setback control suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature in said first room, wherein another thermostat having a room temperature sensing element is employed on a wall in a second room to sense room temperature for control of said heating system effective in said second room to maintain a thermostat selected ambient room temperature in said second room, wherein heating controls for said heating system including a transformer having a secondary winding for providing low voltage 60 Hz power are located in a third room of said building, and wherein thermostat cables coupling said thermostats to said heating controls are located at least partially within interior walls of said building, said method comprising modulating cycles of positive polarity of said low 60 Hz voltage with a high frequency during one set of selected time periods, and modulating cycles of negative polarity of said low 60 Hz voltage with a high frequency during a second set of selected time periods; detecting, at said thermostat cable in said first room, said modulation during cycles of said positive polarity; applying heat to said first room, room temperature sensing element in response to such detected modulation; detecting, at said thermostat cable in said second room, said modulation during cycles of said negative polarity; and applying heat to said second room, room temperature sensing elements in response to such detected modulation during cycles of said negative polarity.
Claim 28
Independent Claim
276 words
A method of temperature setback control suitable for use in a building wherein a thermostat having a room temperature sensing element is employed on a wall in a first room to sense room temperature for control of a heating system effective in said first room to maintain a thermostat selected ambient room temperature in said first room, wherein another thermostat having a room temperature sensing element is employed on a wall in a second room to sense room temperature for control of said heating system effective in said second room to maintain a thermostat selected ambient room temperature in said second room, wherein heating controls for said heating system including a transformer having a secondary winding for providing low voltage 60 Hz power are located in a third room of said building, and wherein thermostat cables coupling said thermostats to said heating controls are located at least partially within interior walls of said building, said method comprising modulating cycles of positive polarity of said low 60 Hz voltage with a high frequency during one set of selected time periods, and modulating cycles of negative polarity of said low 60 Hz voltage with a high frequency during a second set of selected time periods; detecting, at said thermostat cable in said first room, said modulation during cycles of said positive polarity; applying heat to said first room, room temperature sensing element in response to such detected modulation; detecting, at said thermostat cable in said second room, said modulation during cycles of said negative polarity; and applying heat to said second room, room temperature sensing elements in response to such detected modulation during cycles of said negative polarity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |