Patent US1921988A successfully refreshed from Google Patents.
US4144530A
Expired / Lapsed
US
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Combined intrusion sensor line
Assignee: United States Department of the Navy
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Filing: 1977-11-17
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Granted: 1979-03-13
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Expires: 1997-11-17
Abstract
Abstract A single composite cable is deployed between adjacent monitoring stations r sensing an intruder. A number of piezoelectric elements disposed in the cable provide electrical intrusion signals when they are disturbed. Power and triggering pulses for the stations are fed through the cable by a pair of electrical conductors and optical signals representative of the intrusion signals are fed through at least one optical fiber. As a result, the composite cable is relatively lightweight and compact to simplify deployment and it avoids the problems normally associated with crosstalk.
Inventors
- 👤 John T. Redfern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:22
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4416; G02B6/4439; G02B6/4469; G08B13/16; G08B13/1654
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
An apparatus for sensing mechanical vibrations representative of an intruder and feeding representative signals between signal processing modules; means for generating electrical signals in response to the mechanical vibrations caused by the intruder; means disposed adjacent the generating means for providing electrical power and electrical timing pulses to the signal processing modules; means disposed adjacent the generating means and the electrical power and timing pulse providing means for transmitting optical signals representative of the generated electrical signals; and means disposed about the generating means, the electrical power providing means and the optical signal transmitting means for encasing them.
Claim 2
Independent Claim
98 words
An apparatus for sensing mechanical vibrations representative of an intruder and feeding representative signals between signal processing modules; means for generating electrical signals in response to the mechanical vibrations caused by the intruder; means disposed adjacent the generating means for providing electrical power and electrical timing pulses to the signal processing modules; means disposed adjacent the generating means and the electrical power and timing pulse providing means for transmitting optical signals representative of the generated electrical signals; and means disposed about the generating means, the electrical power providing means and the optical signal transmitting means for encasing them.
Claim 3
Dependent Claim
22 words
An apparatus according to claim 1 in which the generating means is a number of piezoelectric elements coupled together in a line.
Claim 4
Dependent Claim
16 words
An apparatus according to claim 2 in which the providing means is at least one wire.
Claim 5
Dependent Claim
17 words
An apparatus according to claim 3 in which the transmitting means is at least one optical fiber.
Claim 6
Dependent Claim
15 words
An apparatus according to claim 4 in which the encasing means is a common tube.
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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |