US4095220A
Expired / Lapsed
US
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Alarm detection and identification system
Assignee: Individual
•
Filing: 1976-08-18
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Granted: 1978-06-13
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Expires: 1996-08-18
Abstract
Abstract An alarm detection and identification system capable of detecting one or more alarms at remote sites and capable of identifying at a detection and identification station which remote sites have had alarms is disclosed. In one embodiment, the electrical signals necessary to distinguish between many remote sites can be carried along a single pair of transmission wires by using distinctive analog addresses for the various remote sites. Also, the system uses only a minimum of energy during non-alarm situations, and thus, can be battery operated. Additionally, the analog address currents are additive, allowing any number of remote sites to be added to the system.
Inventors
- 👤 Joe A. Sadler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:05
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
An alarm detection and identification system comprising, in combination: a detection and identification station including a source of electrical power and means for responding to a plurality of different analog current address signals to provide a distinctive indication of each of said signals to distinguish it from any of the other of said signals; a plurality of remote alarm stations each of which includes a means for generating an alarm signal in response to an alarm condition and a means powered by the source of electrical power for converting the alarm signal into an analog current address signal for identifying the particular remote station, each of said remote stations requiring relatively little power during non-alarm periods; and a means for electrically connecting each of the remote stations in parallel to the detection and identification station to supply electrical power to each of said remote stations, and to conduct said analog address signals to said detection and identification stations.
Claim 2
Dependent Claim
158 words
An alarm detection and identification system comprising, in combination: a detection and identification station including a source of electrical power and means for responding to a plurality of different analog current address signals to provide a distinctive indication of each of said signals to distinguish it from any of the other of said signals; a plurality of remote alarm stations each of which includes a means for generating an alarm signal in response to an alarm condition and a means powered by the source of electrical power for converting the alarm signal into an analog current address signal for identifying the particular remote station, each of said remote stations requiring relatively little power during non-alarm periods; and a means for electrically connecting each of the remote stations in parallel to the detection and identification station to supply electrical power to each of said remote stations, and to conduct said analog address signals to said detection and identification stations.
Claim 3
Dependent Claim
33 words
The alarm detection and identification system of claim 1 wherein the means for electrically connecting the remote stations in parallel to the detection and identification station comprises a single pair of transmission lines.
Claim 4
Dependent Claim
20 words
The alarm detection and identification system of claim 2 wherein said source of electrical current comprises a D-C voltage source.
Claim 5
Dependent Claim
28 words
The alarm detection and identification system of claim 3 wherein said means for responding to a plurality of different analog current address signals comprises a current indicating meter.
Claim 6
Dependent Claim
38 words
The alarm detection and identification station system of claim 4 wherein the possible address current range of the remote stations are increased by providing a means to by-pass the current indicating meter by a fixed amount of current.
Claim 7
Dependent Claim
60 words
The alarm detection and identification system of claim 1 wherein the means for converting the alarm signal into an analog current address signal for identifying the particular remote station comprises a current source, a means for adjusting the amount of current produced, means with the current source in series for activating the current source in response to the alarm signal.
Claim 8
Independent Claim
125 words
A method of detecting and identifying at a central station alarms at remote stations including: generating an alarm signal at each remote station that experiences an alarm condition; converting the alarm signal into an analog current address signal unique to the particular remote station wherein the analog current address signal of each remote station is produced by a current source which is powered by a D-C voltage source located at the central station; transmitting each analog current address signal in parallel with analog current address signals from other remote stations to the central station; and determining which of various remote stations have experienced alarms by comparing the amount of current received at the central station with the analog current addresses of the individual remote stations.
Claim 9
Independent Claim
125 words
A method of detecting and identifying at a central station alarms at remote stations including: generating an alarm signal at each remote station that experiences an alarm condition; converting the alarm signal into an analog current address signal unique to the particular remote station wherein the analog current address signal of each remote station is produced by a current source which is powered by a D-C voltage source located at the central station; transmitting each analog current address signal in parallel with analog current address signals from other remote stations to the central station; and determining which of various remote stations have experienced alarms by comparing the amount of current received at the central station with the analog current addresses of the individual remote stations.
Claim 10
Dependent Claim
48 words
The method of detecting and identifying at a central station alarms at remote stations according to claim 7 wherein the D-C voltage source supplies power to the remote stations by a pair of transmission lines, and the analog current address signals are transmitted along the same transmission lines.
Claim 11
Dependent Claim
82 words
The method of detecting and identifying at a central station alarms at remote stations according to claim 7 wherein the analog current address signal of each remote station is not equal to any combination of analog current address signals of other remote stations and further including the step of determining which combination of various remote stations have experienced alarms by comparing the amount of current received at the central station with combinations of the analog current addresses of the individual remote stations.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |