Patent US1481178A successfully refreshed from Google Patents.
US3714647A
Expired / Lapsed
US
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Light pulse burglar alarm
Assignee: Smith and Wesson Brands Inc
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Filing: 1971-04-26
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Granted: 1973-01-30
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Expires: 1991-04-26
Abstract
Abstract A light pulsating burglar alarm system and method is provided employing a plurality of separated photoflash units that are individually and selectively triggered upon the opening of a door, window, or other opening to produce a high intensity light pulse of predetermined optical characteristics. A centralized detector selectively responds to the light pulse produced by anyone of these triggered units to annunciate the presence of the intruder. Alternatively, one or more light pulse producing relays may be employed to respond to the pulse and produce a secondary light pulse for further transmission to remote locations out of optical communication with the nuts.
Inventors
- 👤 A Litman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:03
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08; G08B1/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A burglar alarm system comprising: a plurality of spaced apart light pulse transmitters, each transmitter coupled to a window, door, and other entry means; and including triggering means for initiating said transmitter to emit a discrete high intensity light pulse of predetermined transient characteristic upon the opening of said entry means, a centralized light pulse detector spaced from and in optical communication with said transmitters, said detector including discriminating means selectively responsive to said predetermined transient characteristic of said light pulse and substantially unresponsive to ambient lighting conditions from other means or changes therein, and means responsive to said detector for producing an alarm signal upon detection of said light pulse.
Claim 2
Dependent Claim
111 words
A burglar alarm system comprising: a plurality of spaced apart light pulse transmitters, each transmitter coupled to a window, door, and other entry means; and including triggering means for initiating said transmitter to emit a discrete high intensity light pulse of predetermined transient characteristic upon the opening of said entry means, a centralized light pulse detector spaced from and in optical communication with said transmitters, said detector including discriminating means selectively responsive to said predetermined transient characteristic of said light pulse and substantially unresponsive to ambient lighting conditions from other means or changes therein, and means responsive to said detector for producing an alarm signal upon detection of said light pulse.
Claim 3
Dependent Claim
111 words
A burglar alarm system comprising: a plurality of spaced apart light pulse transmitters, each transmitter coupled to a window, door, and other entry means; and including triggering means for initiating said transmitter to emit a discrete high intensity light pulse of predetermined transient characteristic upon the opening of said entry means, a centralized light pulse detector spaced from and in optical communication with said transmitters, said detector including discriminating means selectively responsive to said predetermined transient characteristic of said light pulse and substantially unresponsive to ambient lighting conditions from other means or changes therein, and means responsive to said detector for producing an alarm signal upon detection of said light pulse.
Claim 4
Dependent Claim
111 words
A burglar alarm system comprising: a plurality of spaced apart light pulse transmitters, each transmitter coupled to a window, door, and other entry means; and including triggering means for initiating said transmitter to emit a discrete high intensity light pulse of predetermined transient characteristic upon the opening of said entry means, a centralized light pulse detector spaced from and in optical communication with said transmitters, said detector including discriminating means selectively responsive to said predetermined transient characteristic of said light pulse and substantially unresponsive to ambient lighting conditions from other means or changes therein, and means responsive to said detector for producing an alarm signal upon detection of said light pulse.
Claim 5
Dependent Claim
16 words
In the alarm system of claim 15, each of said light transmitters including a photoflash unit.
Claim 6
Dependent Claim
19 words
In the alarm system of claim 15, said photoflash units being a self powered and contact actuated pyrotechnic unit.
Claim 7
Dependent Claim
31 words
In the system of claim 15, said centralized light pulse detector responsive to the generation of a light pulse from any one of said transmitters to produce a secondary light pulse.
Claim 8
Dependent Claim
26 words
In the system of claim 4, plural separated detectors, each such detector disposed in a different location in optical communication with at least one other detector.
Claim 9
Dependent Claim
20 words
In the system of claim 15, additional sensor means for actuating said detector upon determining the presence of an intruder.
Claim 10
Dependent Claim
21 words
In the system of claim 4, additional sensor means for actuating said detector upon determining the presence of an unauthorized intruder.
Claim 11
Dependent Claim
24 words
In the system of claim 5, additional sensor means for actuating one of said plural detectors upon determining the presence of an unauthorized intruder.
Claim 12
Independent Claim
96 words
A method of detecting the presence of an intruder entering into a proscribed area comprising the steps of: sensing the presence of said intruder at any one of a plurality of separate peripheral locations circumscribing said area, triggering the generation of a descrete high intensity light pulse of predetermined transient characteristic at said sensed location, and discriminatingly detecting the generation of said light pulse from any one of a plurality of said locations at a centralized position, and producing an alarm in response to said detection while substantially unresponding to ambient lighting at said centralized location.
Claim 13
Independent Claim
96 words
A method of detecting the presence of an intruder entering into a proscribed area comprising the steps of: sensing the presence of said intruder at any one of a plurality of separate peripheral locations circumscribing said area, triggering the generation of a descrete high intensity light pulse of predetermined transient characteristic at said sensed location, and discriminatingly detecting the generation of said light pulse from any one of a plurality of said locations at a centralized position, and producing an alarm in response to said detection while substantially unresponding to ambient lighting at said centralized location.
Claim 14
Dependent Claim
61 words
In the method of claim 11, the step of detecting including the step of triggering the generation of a secondary light pulse at said central location upon detecting said light pulse from said peripheral location, whereby said sympathetic light pulses serves as a relay to communicate the presence of said intruder to places not in optical communication with said peripheral locations.
Claim 15
Dependent Claim
39 words
In the method of claim 9, the additional step of otherwise sensing the presence of an intruder and producing an alarm in concert with and in the absence of triggering the generation of light pulses at said peripheral locations.
Claim 16
Dependent Claim
108 words
A burglar alarm system comprising: a light pulse transmitter, said transmitter coupled to one of a window, door, and other entry means; and including triggering means for initiating said transmitter to emit a discrete high intensity light pulse of predetermined transient characteristic upon the opening of said entry means, a light pulse detector spaced from and in optical communication with said transmitter, said detector including discriminating means selectively responsive to said predetermined transient characteristic of said light pulse and substantially unresponsive to ambient lighting conditions from other means or changes therein, and means responsive to said detector for producing an alarm signal upon detection of said light pulse.
Claim 17
Dependent Claim
108 words
A burglar alarm system comprising: a light pulse transmitter, said transmitter coupled to one of a window, door, and other entry means; and including triggering means for initiating said transmitter to emit a discrete high intensity light pulse of predetermined transient characteristic upon the opening of said entry means, a light pulse detector spaced from and in optical communication with said transmitter, said detector including discriminating means selectively responsive to said predetermined transient characteristic of said light pulse and substantially unresponsive to ambient lighting conditions from other means or changes therein, and means responsive to said detector for producing an alarm signal upon detection of said light pulse.
Claim 18
Dependent Claim
20 words
In the alarm system of claim 12, said light pulse being in a nonvisible wavelength unobservable to the human eye.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |