US3781804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system
Assignee: Individual
•
Filing: 1972-06-05
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Granted: 1973-12-25
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Expires: 1992-06-05
Abstract
Abstract The disclosure relates to an alarm system wherein a key operated settable switch bank is provided as a part of a circuit which includes a circuit capable of operating in two conditions, one condition indicating that all of a plurality of switches have been properly positioned, the other condition indicating that all of the switches have not been properly positioned. Operation of the key closes a switch which provides an output after a predetermined time delay. If the switches are all properly positioned during the delay period, a power output is provided. If the switches are not all properly set during the predetermined time delay period, an alarm signal is provided.
Inventors
- 👤 M Lederer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:59
CPC Classifications
B; B60; B60R; B60R25/00; B60R25/10; B60R25/1003; G; G08; G08B; G08B13/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A security alarm system comprising: an alarm circuit, a load circuit, a first timing means, permutation switch means having an input terminal and normally set to provide an output to a first terminal and settable by a selectively coded key means movable toward the switch means to provide an output to a second terminal when the input terminal is energized, means in the path of movement of a key toward the switch means for initiating operation of the first timing means, means responsive to the first timing means after a predetermined time following initiation of its operation to energize the input terminal of the switch means, second timing means initiated by an output from the first terminal of the switch means, to cause energization of the alarm circuit a predetermined time following its initiation, said load circuit being connected to the second terminal of the switch means for energization by an output therefrom, and means responsive to energization of the alarm circuit for inhibiting energization of the load circuit.
Claim 2
Dependent Claim
169 words
A security alarm system comprising: an alarm circuit, a load circuit, a first timing means, permutation switch means having an input terminal and normally set to provide an output to a first terminal and settable by a selectively coded key means movable toward the switch means to provide an output to a second terminal when the input terminal is energized, means in the path of movement of a key toward the switch means for initiating operation of the first timing means, means responsive to the first timing means after a predetermined time following initiation of its operation to energize the input terminal of the switch means, second timing means initiated by an output from the first terminal of the switch means, to cause energization of the alarm circuit a predetermined time following its initiation, said load circuit being connected to the second terminal of the switch means for energization by an output therefrom, and means responsive to energization of the alarm circuit for inhibiting energization of the load circuit.
Claim 3
Dependent Claim
32 words
A security alarm system in accordance with claim 1 including means responsive to energization of the load circuit prior to energization of the alarm circuit to inhibit operation of the alarm circuit.
Claim 4
Dependent Claim
41 words
A security alarm system in accordance with claim 2 wherein the alarm circuit includes means for maintaining itself in continuous operation following its energization even after the output from the first terminal is terminated as by withdrawal of the key means.
Claim 5
Dependent Claim
33 words
A security system according to claim 2 wherein the means responsive to the energization of the load circuit, operates to render the second timing means inoperative to prevent operation of the alarm circuit.
Claim 6
Dependent Claim
50 words
A security system according to claim 1 wherein the permutation switch means is mounted within a housing provided with a keyway for the entry of said key means, the means in the path of movement of the key means comprising a switch control means adjacent the entry to the keyway.
Claim 7
Dependent Claim
40 words
A security alarm system according to claim 1 wherein the alarM circuit includes means for maintaining itself in continuous operation following its energization even after the output from the first terminal is terminated as by withdrawal of the key means.
Claim 8
Dependent Claim
47 words
A security alarm system in accordance with claim 1 wherein the load circuit includes means responsive to the output from the second terminal of the switch means for producing a signal of a selected frequency, detecting means responsive to the selected signal frequency for producing an output.
Claim 9
Dependent Claim
28 words
A security alarm system in accordance with claim 6 wherein the means for producing a signal of a selected frequency is adjustable to produce signals of different frequencies.
Claim 10
Dependent Claim
70 words
A security alarm system according to claim 1 wherein said load circuit includes a manually operated switch for applying power from a source to energize the load when the load circuit is energized by an output from the second terminal, and means controlled by operation of the manual switch to apply power from the source in the absence of an output from the second terminals for immediately energizing the alarm.
Claim 11
Dependent Claim
30 words
A security alarm according to claim 9 including means responsive to energization of the load circuit prior to energization of the alarm circuit to inhibit operation of the alarm circuit.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |