Patent US3569741A successfully refreshed from Google Patents.
US3569741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control means for recording device
Assignee: Lanier Electronic Laboratories Inc
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Filing: 1968-03-09
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Granted: 1971-03-09
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Expires: 1988-03-09
Abstract
Abstract A control means for controlling the operation of a recording device having a plurality of modes of operation in response to a plurality of control currents. The control means provides for control of the recording device from one or more operating stations and the control means includes a plurality of current means for providing a plurality of control currents in response to a plurality of potential differences between a plurality of first voltages provided by a circuit means and a variable second voltage provided by a selecting means. The variable second voltage is selectively varied at the recording device from an operating station with substantially no flow of current between the recording device and the operating station and with a minimum number of wires required between the recording device and the operating station. Thus, the control means is reliable because it is independent of fluctuations of current between a recording device and an operating station and is relatively inexpensive because of the small number of wires required between a recording device and an operating station.
Inventors
- 👤 James B Godwin
- 👤 Fred C Bolick Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:23
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/023; G08; G08C; G08C19/00; G08C19/02; G08C19/025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
208 words
In a control means for controlling from a remote operating station the operation of a recording device having a plurality of modes of operation in response to a plurality of control currents; circuit means for simultaneously providing at said recording device a plurality of first voltages which differ from each other in potential; selecting means for sequentially providing at said recording device a plurality of second voltages which differ from each other in potential, each of said plurality of second voltages having a potential which corresponds to the resistance of one of a plurality of resistors which are of different resistances and which are located at said remote operating station and each of said plurality of second voltages being in response to the operation of one of a plurality of switches which are located at said remote operating station and which are constructed and arranged to make said plurality of resistors selectively operative to provide said plurality of second voltages; and a plurality of current means for providing a plurality of control currents restricted to said recording device when operative, one of said current means being operatively responsive to a potential difference between another of said plurality of first voltages and another of said plurality of second voltages.
Claim 2
Dependent Claim
208 words
In a control means for controlling from a remote operating station the operation of a recording device having a plurality of modes of operation in response to a plurality of control currents; circuit means for simultaneously providing at said recording device a plurality of first voltages which differ from each other in potential; selecting means for sequentially providing at said recording device a plurality of second voltages which differ from each other in potential, each of said plurality of second voltages having a potential which corresponds to the resistance of one of a plurality of resistors which are of different resistances and which are located at said remote operating station and each of said plurality of second voltages being in response to the operation of one of a plurality of switches which are located at said remote operating station and which are constructed and arranged to make said plurality of resistors selectively operative to provide said plurality of second voltages; and a plurality of current means for providing a plurality of control currents restricted to said recording device when operative, one of said current means being operatively responsive to a potential difference between another of said plurality of first voltages and another of said plurality of second voltages.
Claim 3
Dependent Claim
29 words
The control means of claim 1 in which each of said plurality of second voltages is of substantially the same potential at all of said plurality of current means.
Claim 4
Dependent Claim
26 words
The control means of claim 2 in which said circuit means applies said plurality of first voltages simultaneously to all of said plurality of current means.
Claim 5
Dependent Claim
28 words
The control means of claim 3 in which said selecting means applies one of said plurality of second voltages simultaneously to all of said plurality of current means.
Claim 6
Dependent Claim
36 words
The control means of claim 4 in which each of said plurality of control currents has an amplitude which is independent of the amplitudes of said plurality of first voltages and said plurality of second voltages.
Claim 7
Dependent Claim
71 words
The control means of claim 1 in which each of said plurality of current means includes a first potential responsive element for providing an output potential in response to a potential difference between one of said plurality of first voltages and one of said plurality of a second voltages, and a second potential responsive element for continuously providing one of said plurality of control currents in response to said output potential.
Claim 8
Dependent Claim
44 words
The control means of claim 1 in which said selecting means includes a second circuit means which selectively includes one of said plurality of resistors and one of said plurality of switches and which operatively connects said plurality of resistors to said recording device.
Claim 9
Dependent Claim
45 words
The control means of claim 1 in which each of said current means includes a first switching means for providing a voltage output in response to a potential difference and a second switching means for providing a control current in response to said voltage output.
Claim 10
Dependent Claim
72 words
The control means of claim 8 in which said said first switching means is a first transistor having a collector, an emitter to which one of said plurality of first voltages is applied, anD a base to which all of said plurality of second voltages are applied in sequence; and in which said second switching means is a second transistor having a base operatively connected to said collector of said first transistor.
Claim 11
Dependent Claim
16 words
The control means of claim 9 in which said circuit means includes a voltage divider circuit.
Claim 12
Dependent Claim
23 words
The control means of claim 10 in which said selecting means includes a voltage divider circuit which selectively includes said plurality of resistors.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |