US3665462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system
Assignee: GARSIDE CORP
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Filing: 1970-04-20
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Granted: 1972-05-23
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Expires: 1990-04-20
Abstract
Abstract An alarm system the operation of which is controlled by a key switch and, if desired, by a seven-button decoder. Several abnormality detecting devices are connected to a computer dialer. The detecting devices may consist of a wide variety of sensors, three types of which are mentioned in this specification. Upon receipt of an alarm signal from a detecting device, some of the computer dialer circuitry interrogates that signal and, as a function of that signal, actuates the proper output circuitry of the computer dialer. The output circuitry specifically comprises a two-track tape playback and telephone dialing equipment for use with a commercial telephone system to deliver one or more prerecorded telephone warning messages to selected persons. The system cannot be jammed by incoming calls. An alarm device adapter for use with such equipment as cameras, tape recorders, lights, sirens or bells may also be provided.
Inventors
- 👤 William Joe Seaton
- 👤 Arnold T Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:27
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04; H04M11/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A radar sensor adapted to comprise part of an alarm system for detection of movement in a monitored volume of space, the radar sensor comprising external antenna means, oscillator means for producing high frequency electro-magnetic radiation, shielded comparison parasitic antenna means, and means for connecting the radar sensor to a source of electrical power, the radar sensor further comprising voltage amplification means electrically connected to tap means at the external antenna means and to tap means at the comparison parasitic antenna means, the voltage amplification means sensing and amplifying variations in the difference voltage between the external antenna means and the comparison parasitic antenna means.
Claim 2
Dependent Claim
105 words
A radar sensor adapted to comprise part of an alarm system for detection of movement in a monitored volume of space, the radar sensor comprising external antenna means, oscillator means for producing high frequency electro-magnetic radiation, shielded comparison parasitic antenna means, and means for connecting the radar sensor to a source of electrical power, the radar sensor further comprising voltage amplification means electrically connected to tap means at the external antenna means and to tap means at the comparison parasitic antenna means, the voltage amplification means sensing and amplifying variations in the difference voltage between the external antenna means and the comparison parasitic antenna means.
Claim 3
Dependent Claim
46 words
A radar sensor as defined in claim 1 wherein the voltage amplification means are closely juxtaposed and joined to both antenna means for transmitting the differential signal voltage from the antenna means to the voltage amplification means without inducing stray voltages or incurring large voltage drops.
Claim 4
Dependent Claim
51 words
A radar sensor as defined in claim 1 further comprising voltage regulation circuitry connected to the voltage amplification means and to the oscillator means for supplying both with well regulated voltage to develop a strong amplified output which is not materially influenced by spuriously induced signals, whereby false alarms are alleviated.
Claim 5
Dependent Claim
123 words
In a method of generating radar-derived signals at a remote sensing location, the steps of: issuing electro-magnetic radiation within a monitored region from an external antenna at the sensing location, the impedance of radiation being varied by movement within the region; establishing a reference radiation in a controlleD environment; comparing at the sensing location any variation at which the radiation is issued from the external antenna to the reference radiation; generating at the sensing location a time-variant difference signal which corresponds to variations in issuance of radiation from the external antenna caused by movement within the region; amplifying the difference signal at the sensing location to render induced stray and spurious signals insignificant by comparison; transmitting the amplified signal to remote alarm circuitry.
Claim 6
Dependent Claim
123 words
In a method of generating radar-derived signals at a remote sensing location, the steps of: issuing electro-magnetic radiation within a monitored region from an external antenna at the sensing location, the impedance of radiation being varied by movement within the region; establishing a reference radiation in a controlleD environment; comparing at the sensing location any variation at which the radiation is issued from the external antenna to the reference radiation; generating at the sensing location a time-variant difference signal which corresponds to variations in issuance of radiation from the external antenna caused by movement within the region; amplifying the difference signal at the sensing location to render induced stray and spurious signals insignificant by comparison; transmitting the amplified signal to remote alarm circuitry.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |