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US4134108A
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Emergency alarm device
Assignee: RES Q Inc
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Filing: 1977-01-21
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Granted: 1979-01-09
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Expires: 1997-01-21
Abstract
Abstract A portable and addressable emergency alarm device which transmits a selected radio frequency alarm signal from a portable transmitter to a stationary receiver and sounds an alarm.
Inventors
- 👤 Ray W. Palmer
- 👤 Fay H. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:07
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/10; G08B21/00; G08B21/02; G08B21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A transmitter-receiver emergency signalling device, the transmitter of which may be carried on the person, comprising: (a) means for generating a system address pulse train of a fixed number of pulses, the width of each pulse being determined by whether or not the pulse represents a "one" or a "zero;" (b) means for setting the pulse width of the pulses in the pulse train and thereby determining the system address; (c) radio frequency transmission means the carrier signal of which is modulated by the pulse train; (d) a radio frequency receiver means responsive to the transmitted signal; (e) means for determing that each of the fixed number of pulses in the pulse train have been received; (f) address decoding means adapted to receive the pulse train and compare an address received with the system address; and (g) an alarm responsive to a comparison of the received address and the system address.
Claim 2
Dependent Claim
151 words
A transmitter-receiver emergency signalling device, the transmitter of which may be carried on the person, comprising: (a) means for generating a system address pulse train of a fixed number of pulses, the width of each pulse being determined by whether or not the pulse represents a "one" or a "zero;" (b) means for setting the pulse width of the pulses in the pulse train and thereby determining the system address; (c) radio frequency transmission means the carrier signal of which is modulated by the pulse train; (d) a radio frequency receiver means responsive to the transmitted signal; (e) means for determing that each of the fixed number of pulses in the pulse train have been received; (f) address decoding means adapted to receive the pulse train and compare an address received with the system address; and (g) an alarm responsive to a comparison of the received address and the system address.
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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |