Patent US4979796A successfully refreshed from Google Patents.
US4979796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally controlled optical fiber
Assignee: Charles Stark Draper Laboratory Inc
•
Filing: 1989-12-15
•
Granted: 1990-12-25
•
Expires: 2009-12-15
Abstract
Abstract A temperature stable optical fiber includes an elongated, flexible optically transmissive core and associated circumferential cladding, and a heater for selectively heating said core and cladding. The heater includes a resistive film disposed about and in thermal contact with the outer surface of the cladding, whereby the temperatures of said core and cladding are controlled.
Inventors
- 👤 Donato Cardarelli
- 👤 Frederick J. Petri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:28
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4439; G02B6/4457; G01; G01C; G01C19/00; G01C19/58; G01C19/64; G01C19/72; G01C19/721; G01C19/722; G01D; G01D5/00; G01D5/26; G01D5/268; G02B6/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A temperature stable optical fiber, comprising: A. an elongated, flexible optically transmissive core and associated circumferential cladding, and B. means for selectively heating said core and cladding, said heating means including a resistive film disposed about and in thermal contact with the outer surface of said cladding, whereby the temperatures of said core and cladding are controlled.
Claim 2
Dependent Claim
57 words
A temperature stable optical fiber, comprising: A. an elongated, flexible optically transmissive core and associated circumferential cladding, and B. means for selectively heating said core and cladding, said heating means including a resistive film disposed about and in thermal contact with the outer surface of said cladding, whereby the temperatures of said core and cladding are controlled.
Claim 3
Dependent Claim
41 words
An optical fiber according to claim 1 further comprising: sensor means for detecting the temperature of said core and cladding, said sensor means including a temperature sensitive film disposed about and in thermal contact with the outer surface of said cladding.
Claim 4
Dependent Claim
28 words
An optical fiber according to claims 1 or 2 wherein said heating means further includes a power supply means for selectively driving a current through said resistive film.
Claim 5
Dependent Claim
40 words
An optical fiber according to claim 2 wherein said temperature sensitive film and said resistive film are a single thermistor film, said thermistor film having a negative temperature coefficient of resistance over a predetermined range of current through said film.
Claim 6
Dependent Claim
30 words
An optical fiber according to claim 4 wherein said heating means further includes a power supply means for selectively driving a current in said predetermined range through said thermistor film.
Claim 7
Dependent Claim
33 words
An optical fiber according to claim 2 wherein said resistive film is adjacent to said cladding and wherein said resistive film and said temperature sensitive film are separated by an electrically insulating film.
Claim 8
Dependent Claim
63 words
An optical fiber according to claim 2 wherein said heating means further includes means coupled to said temperature sensitive film for generating a temperature signal representative of the temperature of said temperature sensitive film, and includes a power supply means responsive to said temperature signal for driving a current through said resistive film whereby the temperature of said core is maintained substantially constant.
References Cited (Backward Citations)
US3445666A
Cited
US3617108A
Cited
US4095101A
Cited
US3647277A
Cited
US4782492A
Cited
US4883337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |