Patent US4418338A successfully refreshed from Google Patents.
US4418338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fibre U.V. and/or I.R. line fire detector
Assignee: Individual
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Filing: 1980-11-20
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Granted: 1983-11-29
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Expires: 2000-11-20
Abstract
Abstract A fire and/or heat detection system comprises an optical fibre which is either unsheathed or sheathed in a transparent material such that U.V. or I.R. radiation in the vicinity of the fibre passes through the skin into the body of the fibre. Means are connected to the ends of the fibre to measure these radiations.
Inventors
- 👤 Dennis W. Burt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:16
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
A fire detection system comprising an optical fibre having first and second ends and an exterior surface extending between the first and second ends and means connected to the optical fibre for detecting at least one of U.V. and I.R. radiation, said radiation being absorbed through any point of the entire exterior surface of the fibre.
Claim 2
Dependent Claim
56 words
A fire detection system comprising an optical fibre having first and second ends and an exterior surface extending between the first and second ends and means connected to the optical fibre for detecting at least one of U.V. and I.R. radiation, said radiation being absorbed through any point of the entire exterior surface of the fibre.
Claim 3
Dependent Claim
12 words
The detection system as in claim 1 wherein the fibre is unsheathed.
Claim 4
Dependent Claim
18 words
The detection system as in claim 1 wherein the fibre is sheathed in material transparent to U.V. radiation.
Claim 5
Dependent Claim
19 words
The detection system as in claim 1 wherein the fibre is sheathed in a material transparent to I.R. radiation.
Claim 6
Dependent Claim
21 words
The detection system as in claim 1 wherein the fibre is sheathed in a material transparent to U.V. and I.R. radiation.
Claim 7
Dependent Claim
35 words
The detection system as in claim 1, 2, 3 or 5 wherein U.V. radiation detectors are connected to at least one end of the fibre to detect and measure U.V. radiations absorbed by the fibre.
Claim 8
Dependent Claim
40 words
The detection system as in claim 1, 2, 3 or 5 wherein a U.V. radiation detector is connected to one end of the fibre and a test source of U.V. radiation is connected to the other end of the fibre.
Claim 9
Dependent Claim
35 words
The detection system as in claim 1, 2, 4 or 5 wherein I.R. radiation detectors are connected to at least one end of the fibre to detect and measure I.R. radiations absorbed by the fibre.
Claim 10
Dependent Claim
40 words
The detection system as in claim 1, 2, 4 or 5 wherein an I.R. radiation detector is connected to one end of the fibre and a test source of I.R. radiation is connected to the other end of the fibre.
Claim 11
Dependent Claim
52 words
The detection system as in claim 1, 2, 3, 4 or 5 wherein a U.V. radiation detector is connected to one end of the fibre and an I.R. radiation detector is connected to the other end of the fibre to detect and measure both U.V. and I.R. radiations absorbed by the fibre.
Claim 12
Dependent Claim
29 words
The detection system as in claim 1, 2 or 5 wherein the fibre is installed in and around a predetermined area to be monitored for U.V. and I.R. radiation.
Claim 13
Dependent Claim
88 words
The detection system as in claim 1, 2, 3, 4 or 5 wherein: a U.V. radiation detector is connected to one end of the fibre; an I.R. radiation detector is connected to the other end of the fibre; the fibre is installed in and around a predetermined area to monitor U.V. and I.R. radiation; and further including means, responsive to signals from the U.V. and I.R. detectors which are proportional to the detected U.V. and I.R. radiation, for indicating the occurrence of a fire in the predetermined area.
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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |