US4868381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber optic interferometric thermometer
Assignee: Optical Technologies Inc
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Filing: 1988-01-26
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Granted: 1989-09-19
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Expires: 2008-01-26
Abstract
Abstract A single fiber optic optical sensor in one segment of a divided interferometer and a remote demodulation interferometer segment associated therewith.
Inventors
- 👤 Charles M. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:48
CPC Classifications
G; G01; G01K; G01K5/00; G01K5/48; G01K5/50; G01K5/52; G01K1/00; G01K1/02; G01K1/026; G01K11/00; G01K11/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
Fiber optic temperature measuring devise comprising, a single optic fiber for the input of light to a first leg of a divided interferometer, an optical fiber sensor in said first leg of the divided interferometer, and an interferometer means remote from the sensor to receive light from the said single optical fiber, said interferometer means coupled and matched in length to said optical fiber sensor.
Claim 2
Dependent Claim
65 words
Fiber optic temperature measuring devise comprising, a single optic fiber for the input of light to a first leg of a divided interferometer, an optical fiber sensor in said first leg of the divided interferometer, and an interferometer means remote from the sensor to receive light from the said single optical fiber, said interferometer means coupled and matched in length to said optical fiber sensor.
Claim 3
Dependent Claim
20 words
The fiber optic temperature measuring device as defined in claim 1 wherein the remote interferometer means has a Michelson configuration.
Claim 4
Dependent Claim
20 words
The fiber optic temperature measuring device as defined in claim 1 wherein the remote interferometer means has a Mach-Zehnder configuration.
Claim 5
Dependent Claim
20 words
The fiber optic temperature measuring device as defined in claim 1 wherein the remote interferometer means has a Fabry-Perot configuration.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |