Patent US4199682A successfully refreshed from Google Patents.
US4199682A
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US
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Fire and explosion detection apparatus
Assignee: Spectronix Ltd
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Filing: 1978-05-03
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Granted: 1980-04-22
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Expires: 1998-05-03
Abstract
Abstract Fire and explosion detection apparatus comprises an ultra violet detector providing a first output signal in response to receipt of ultra violet radiation and an infra red detector providing a second output signal in response to receipt of infra red radiation. A logical AND circuit, in response to simultaneously occurring first and second output signals, provides a third output signal indicative of simultaneous receipt of ultra violet and infra red radiation.
Inventors
- 👤 Dov Spector
- 👤 Yechiel Spector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:54
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
Fire and explosion detection apparatus comprising: a first detector for sensing radiation within a first frequency range excluding radiation in the visible spectrum and providing a first output indication in response to receipt of such radiation; a second detector for sensing radiation within a second frequency range excluding radiation in the visible spectrum and providing a second output indication in response to receipt of such radiation; and logic means for ANDing said first and second output indications and providing a third output indication of simultaneous receipt of radiation within said first and second frequency ranges.
Claim 2
Dependent Claim
95 words
Fire and explosion detection apparatus comprising: a first detector for sensing radiation within a first frequency range excluding radiation in the visible spectrum and providing a first output indication in response to receipt of such radiation; a second detector for sensing radiation within a second frequency range excluding radiation in the visible spectrum and providing a second output indication in response to receipt of such radiation; and logic means for ANDing said first and second output indications and providing a third output indication of simultaneous receipt of radiation within said first and second frequency ranges.
Claim 3
Dependent Claim
25 words
Fire and explosion detection apparatus according to claim 1, wherein said first detector is a UV detector and said second detector is an IR detector.
Claim 4
Dependent Claim
24 words
Fire and explosion detection apparatus according to claim 1, wherein said second detector operates in a wave length range of 1.5 to 3.0 microns.
Claim 5
Dependent Claim
23 words
Fire and explosion detection apparatus according to claim 3, wherein said second detector operates in a wave length range limited to 2.5-2.75 microns.
Claim 6
Dependent Claim
25 words
Fire and explosion detection apparatus according to claim 1, wherein said first detector operates in a wave length range of up to 0.3 microns approximately.
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) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |