US3761914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system
Assignee: BELL TELEVISION Inc
•
Filing: 1972-03-10
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Granted: 1973-09-25
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Expires: 1992-03-10
Abstract
Abstract An alarm system for use in conjunction with a community antenna television system which includes the concept of by-passing the amplifiers along the transmission lines of the community antenna television and including an arrangement for determining the existence of fire, intrusion, and other types of emergency conditions and sending back across the community antenna television system a coded signal to a receiver at the central office of the community antenna television system. There is provided a further arrangement for ascertaining at the central office whether the system is in operating condition or not.
Inventors
- 👤 G Hardy
- 👤 M David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:46
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/08; G08B25/085; H; H04; H04N; H04N7/00; H04N7/16; H04N7/173
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
226 words
An alarm system for use with a transmission system of the type including a central office having a program source of information, transmitting means at said central office for converting said information into electric signals, at least two receiving stations, a receiver at each of said receiving stations for receiving said electric signals and for converting said signals to said information, and transmission paths interconnecting said central office and said receiving stations for the transmission of said electric signals therebetween; said alarm system comprising an alarm transmitter at each of said receiving stations for transmitting an alarm signal via said transmission paths to said central office in response to an alarm condition at said receiving station, an alarm signal receiving device at said central office responsive to an alarm signal for indicating the reception of said alarm signal and the receiving station originating said alarm signal, each of said alarm transmitters including supervisory means responsive to the reception of a key signal for transmitting a supervisory signal indicating the associated alarm transmitter is operating properly to said alarm receiving device via said transmission paths, each of said supervisory means including control means for transmitting said supervisory signals from each of said alarm transmitters in a different position in a signal property demain, and a key signal generator at said central office for generating said key signal.
Claim 2
Dependent Claim
226 words
An alarm system for use with a transmission system of the type including a central office having a program source of information, transmitting means at said central office for converting said information into electric signals, at least two receiving stations, a receiver at each of said receiving stations for receiving said electric signals and for converting said signals to said information, and transmission paths interconnecting said central office and said receiving stations for the transmission of said electric signals therebetween; said alarm system comprising an alarm transmitter at each of said receiving stations for transmitting an alarm signal via said transmission paths to said central office in response to an alarm condition at said receiving station, an alarm signal receiving device at said central office responsive to an alarm signal for indicating the reception of said alarm signal and the receiving station originating said alarm signal, each of said alarm transmitters including supervisory means responsive to the reception of a key signal for transmitting a supervisory signal indicating the associated alarm transmitter is operating properly to said alarm receiving device via said transmission paths, each of said supervisory means including control means for transmitting said supervisory signals from each of said alarm transmitters in a different position in a signal property demain, and a key signal generator at said central office for generating said key signal.
Claim 3
Dependent Claim
33 words
An alarm system as in claim 1, in which said control means includes timing means and said signal property domain comprises the time domain whereby said supervisory signals are transmitted at different times.
Claim 4
Dependent Claim
50 words
An alarm system as in claim 2, in which said timing means comprises a time delay relay, each time delay relay at each of said receiving stations having a different interval of operation whereby each alarm transmitter is energized in a preselected sequence after the reception of said key signal.
Claim 5
Dependent Claim
54 words
An alarm system as in claim 3, in which said transmission paths comprise one-way amplifiers for amplifying the signal transmitted from said central office to said receiving station, and by-pass means around each of said one-way amplifiers for providing a path for the transmission of signals from said receiving stations to said central office.
Claim 6
Dependent Claim
74 words
An alarm system as in claim 2, in which each of said alarm transmitters comprises an alarm signal generator for generating an alarm signal, indicative of a particular alarm condition, and a plurality of alarm sensors connected to said alarm signal generator, each one of said plurality of alarm sensors being operable to sense a different alarm condition and cause said alarm signal generator to generate an alarm signal indicating the sensed alarm condition.
Claim 7
Dependent Claim
30 words
An alarn system as in claim 5, in which said alarm signal generator includes identifying means for generating an address signal for identifying the receiving station transmitting the alarm signal.
Claim 8
Dependent Claim
210 words
In combination, an alarm and signal transmission system comprising a central office and a plurality of receiving stations interconnected by transmission paths for the transmission of energy therebetween a program source of information at said central office, program transmitting means at said central office for transmitting said information to said plurality of recieving stations via said transmission paths, receiving means at each of said receiving stations for receiving said information from said central office, an alarm signal generator at each one of said plurality of receiving stations for generating an alarm signal indicating an alarm condition and a supervisory signal indicating an operating condition and for transmitting said signals to said central office via said transmission paths, at least one alarm sensor at each one of said plurality of receiving stations for causing said alarm signal generator to generate and transmit the alarm signal, an alarm signal receiver at said central office for indicating the reception of an alarm signal, control means at each one of said plurality receiving stations operable in response to a key signal for causing said alarm signal generators to generate and transmit said supervisory signals in a preselected sequence, and a selectively operable key signal generator at said central office for generating said key signal.
Claim 9
Dependent Claim
210 words
In combination, an alarm and signal transmission system comprising a central office and a plurality of receiving stations interconnected by transmission paths for the transmission of energy therebetween a program source of information at said central office, program transmitting means at said central office for transmitting said information to said plurality of recieving stations via said transmission paths, receiving means at each of said receiving stations for receiving said information from said central office, an alarm signal generator at each one of said plurality of receiving stations for generating an alarm signal indicating an alarm condition and a supervisory signal indicating an operating condition and for transmitting said signals to said central office via said transmission paths, at least one alarm sensor at each one of said plurality of receiving stations for causing said alarm signal generator to generate and transmit the alarm signal, an alarm signal receiver at said central office for indicating the reception of an alarm signal, control means at each one of said plurality receiving stations operable in response to a key signal for causing said alarm signal generators to generate and transmit said supervisory signals in a preselected sequence, and a selectively operable key signal generator at said central office for generating said key signal.
Claim 10
Dependent Claim
50 words
A transmission system as in claim 7, in which said alarm signal generator comprises encoding means for encoding a receiver identifying signal as part of said transmitted signals, and said alarm signal receiver comprises decoding means for decoding said receiver identifying signal to indicate the receiver transmitting the received signals.
Claim 11
Dependent Claim
65 words
A transmission system as in claim 7, in which said control means comprises a receiver for detecting said key signal, and a time delay relay connected to said receiver and being operable by said receiver in response to the detection of said key signal, and wherein the time delay relays at each one of said plurality of receiving stations has a different interval of operation.
Claim 12
Dependent Claim
50 words
A transmission system as in claim 7, in which a plurality of alarm sensors are provided at each one of said plurality of receiving stations for sensing different alarm conditions, and for causing said alarm signal generator to generate and transmit an alarm signal indicative of the sensed alarm condition.
References Cited (Backward Citations)
US3255306A
Cited
US3401234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |