Patent US3939419A successfully refreshed from Google Patents.
US3939419A
Expired / Lapsed
US
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Security remote control method and system
Assignee: United States Department of the Army
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Filing: 1956-11-06
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Granted: 1976-02-17
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Expires: 1976-11-06
Abstract
Abstract 1. A security remote control system comprising a pair of carrier generato means for balance modulating both the carriers from said generators by a single source of noise at a first station and means for transmitting only the side bands, a receiver at a second station for said side bands, means for combining the side bands of said pair of carriers to provide a beat frequency signal corresponding to the frequency difference of said pair of carriers, narrow band filter means to isolate said signal, and means responsive to said signal for controlling an operation at said second station.
Inventors
- 👤 Herbert G. Lindner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:07
CPC Classifications
H; H04; H04K; H04K3/00; H04K3/20; H04K3/25; F; F42; F42D; F42D1/00; F42D1/04; F42D1/045; F42D1/05; G; G08; G08C; G08C19/00; G08C19/12; H04K3/40; H04K3/42; H04K3/80; H04K3/92
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A security remote control system comprising a pair of carrier generators, means for balance modulating both the carriers from said generators by a single source of noise at a first station and means for transmitting only the side bands, a receiver at a second station for said side bands, means for combining the side bands of said pair of carriers to provide a beat frequency signal corresponding to the frequency difference of said pair of carriers, narrow band filter means to isolate said signal, and means responsive to said signal for controlling an operation at said second station.
Claim 2
Dependent Claim
98 words
A security remote control system comprising a pair of carrier generators, means for balance modulating both the carriers from said generators by a single source of noise at a first station and means for transmitting only the side bands, a receiver at a second station for said side bands, means for combining the side bands of said pair of carriers to provide a beat frequency signal corresponding to the frequency difference of said pair of carriers, narrow band filter means to isolate said signal, and means responsive to said signal for controlling an operation at said second station.
Claim 3
Dependent Claim
145 words
A security remote control system comprising a plurality of carrier generators, means for modulating the carriers from said generators by noise at a first station and transmitting only the side bands, a receiver for said side bands at a second station, means for combining the side bands of one pair of said carriers both modulated by the same source of noise to provide a beat frequency signal corresponding to the frequency difference of said one pair of carriers, means for combining the side bands of a second pair of said carriers also both modulated by the same source of noise to provide a second beat frequency signal corresponding to the frequency difference of said second pair of carriers, narrow band filter means to isolate each of said signals, and means responsive to a combination of said signals for controlling an operation at said second station.
Claim 4
Dependent Claim
145 words
A security remote control system comprising a plurality of carrier generators, means for modulating the carriers from said generators by noise at a first station and transmitting only the side bands, a receiver for said side bands at a second station, means for combining the side bands of one pair of said carriers both modulated by the same source of noise to provide a beat frequency signal corresponding to the frequency difference of said one pair of carriers, means for combining the side bands of a second pair of said carriers also both modulated by the same source of noise to provide a second beat frequency signal corresponding to the frequency difference of said second pair of carriers, narrow band filter means to isolate each of said signals, and means responsive to a combination of said signals for controlling an operation at said second station.
Claim 5
Dependent Claim
160 words
A security remote control system comprising a plurality of carrier generators, means for modulating the carriers from said generators by noise at a first station and transmitting only the side bands, a receiver at a second station for the side bands of said carriers, means for combining the side bands of one pair of said carriers both modulated by the same source of noise to provide one beat frequency signal corresponding to the frequency difference of said one pair of carriers, means for combining the side bands of a second pair of said carriers also both modulated by the same source of noise to provide a second beat frequency signal corresponding to the frequency difference of said second pair of carriers, said frequency differences being maintained equal at said first station, narrow band filter means to isolate each of said signals and means responsive to the combination of said equal frequency signals for controlling an operation at said second station.
Claim 6
Dependent Claim
160 words
A security remote control system comprising a plurality of carrier generators, means for modulating the carriers from said generators by noise at a first station and transmitting only the side bands, a receiver at a second station for the side bands of said carriers, means for combining the side bands of one pair of said carriers both modulated by the same source of noise to provide one beat frequency signal corresponding to the frequency difference of said one pair of carriers, means for combining the side bands of a second pair of said carriers also both modulated by the same source of noise to provide a second beat frequency signal corresponding to the frequency difference of said second pair of carriers, said frequency differences being maintained equal at said first station, narrow band filter means to isolate each of said signals and means responsive to the combination of said equal frequency signals for controlling an operation at said second station.
Claim 7
Dependent Claim
144 words
A security remote control system comprising a plurality of carrier generators, means for modulating the carriers from said generators by a single source of noise at a first station and transmitting only the side bands, a receiver at a second station for said side bands, means for combining the side bands of one pair of said carriers to provide a beat frequency signal corresponding to the frequency difference of said one pair of carriers, means for combining the side bands of a second pair of said carriers to provide a second beat frequency signal corresponding to the frequency difference of said second pair of carriers, said frequency differences being maintained equal at said first station, narrow band filter means to isolate each of said signals and means responsive to the combination of said equal frequency signals for controlling an operation at said second station.
Claim 8
Dependent Claim
144 words
A security remote control system comprising a plurality of carrier generators, means for modulating the carriers from said generators by a single source of noise at a first station and transmitting only the side bands, a receiver at a second station for said side bands, means for combining the side bands of one pair of said carriers to provide a beat frequency signal corresponding to the frequency difference of said one pair of carriers, means for combining the side bands of a second pair of said carriers to provide a second beat frequency signal corresponding to the frequency difference of said second pair of carriers, said frequency differences being maintained equal at said first station, narrow band filter means to isolate each of said signals and means responsive to the combination of said equal frequency signals for controlling an operation at said second station.
References Cited (Backward Citations)
US1565521A
Cited
US2658992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |