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Patent US3585581A successfully refreshed from Google Patents.
US3585581A
Expired / Lapsed
US
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Seismic sensor apparatus
Assignee: Honeywell Inc
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Filing: 1969-07-22
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Granted: 1971-06-15
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Expires: 1989-07-22
Abstract
Abstract Discriminating, range limited, seismic sensor apparatus particularly applicable to intrusion detection systems. The preferred embodiment of the invention provides discrimination between vehicular and personnel travel in the area of the sensor. Discrimination and range limiting is provided by sensing seismic disturbances at two frequencies, relying upon the frequencydependence of attenuation of seismic waves.
Inventors
- 👤 Kenneth E Aune
- 👤 Gerald F Jacobs
- 👤 Gary W Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:29
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1654; G08B13/1663; G01; G01V; G01V1/00; G01V1/001; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
Seismic sensor apparatus, comprising: a high frequency seismic sensor; a low frequency seismic sensor; counter means, connected to said high frequency sensor, for counting high frequency seismic pulses; control means, connected to said counter means and to said low frequency seismic sensor, for signalling after a predetermined number of high frequency pulses are received in the absence of low frequency signals.
Claim 2
Dependent Claim
61 words
Seismic sensor apparatus, comprising: a high frequency seismic sensor; a low frequency seismic sensor; counter means, connected to said high frequency sensor, for counting high frequency seismic pulses; control means, connected to said counter means and to said low frequency seismic sensor, for signalling after a predetermined number of high frequency pulses are received in the absence of low frequency signals.
Claim 3
Dependent Claim
78 words
Intrusion detection apparatus, comprising: first seismic sensor means for detecting seismic disturbances corresponding to personnel movement in the area of said sensor; second seismic sensor means for detecting disturbances corresponding to vehicular movement, operating at a lower frequency than said first seismic sensor means; and control means, connected to said first and second seismic sensor means, for signalling an intrusion when said first seismic sensor means detects personnel and said second sensor means does not detect a vehicle.
Claim 4
Dependent Claim
78 words
Intrusion detection apparatus, comprising: first seismic sensor means for detecting seismic disturbances corresponding to personnel movement in the area of said sensor; second seismic sensor means for detecting disturbances corresponding to vehicular movement, operating at a lower frequency than said first seismic sensor means; and control means, connected to said first and second seismic sensor means, for signalling an intrusion when said first seismic sensor means detects personnel and said second sensor means does not detect a vehicle.
Claim 5
Dependent Claim
59 words
Apparatus of claim 2 where in said first seismic sensor means comprises: a seismic sensor; amplifier means for amplifying a signal from said seismic sensor; rectifier means for rectifying the amplified signal; threshold detector means connected to said rectifier means; and counter means, connected to said threshold detector means, for counting each time a signal exceeds the detector threshold.
Claim 6
Dependent Claim
40 words
Apparatus of claim 2 wherein said second seismic sensor means comprises: a seismic sensor; amplifier means for amplifying a signal from said seismic sensor; rectifier means for rectifying the amplified signal; and threshold detector means connected to said rectifier means.
Claim 7
Dependent Claim
128 words
Intrusion detection apparatus comprising: a high frequency channel, comprising: seismic sensor means; threshold detector means connected to said seismic sensor means; counter means connected to the output of said threshold detector means, providing an output signal with a level depending on the number of high frequency seismic disturbances counted; second threshold detector means connected to the output of said counter means for providing an output when a predetermined count is reached; a low frequency channel, comprising: seismic sensor means, threshold detector means connected to the output of said seismic sensor means for providing an output when the seismic signals sensed exceed a certain level; logic means for actuating an indicator when there is an output from said high frequency channel and no output from said low frequency channel.
Claim 8
Dependent Claim
128 words
Intrusion detection apparatus comprising: a high frequency channel, comprising: seismic sensor means; threshold detector means connected to said seismic sensor means; counter means connected to the output of said threshold detector means, providing an output signal with a level depending on the number of high frequency seismic disturbances counted; second threshold detector means connected to the output of said counter means for providing an output when a predetermined count is reached; a low frequency channel, comprising: seismic sensor means, threshold detector means connected to the output of said seismic sensor means for providing an output when the seismic signals sensed exceed a certain level; logic means for actuating an indicator when there is an output from said high frequency channel and no output from said low frequency channel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |