US4375314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared optical fiber
Assignee: ISHIZAKA SEIICHI DIRECTOR-GENERAL OF AGENCY OF INDUSTRIAL SCIENCE AND TECHNOLOGY
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Filing: 1981-01-14
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Granted: 1983-03-01
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Expires: 2001-01-14
Abstract
Abstract An optical fiber for infrared transmission constructed by winding a cladding around a core in the manner of a coil, the cladding having a refractive index lower than that of the core, a protective tube being employed to jacket the clad core.
Inventors
- 👤 Shiro Sakuragi
- 👤 Kyoshiro Imagawa
- 👤 Mitsunori Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:03
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; G; G02; G02B; G02B1/00; G02B1/02; G02B6/00; G02B6/10; G02B6/102; C03B2201/00; C03B2201/80; C03B2201/84; C03B2203/00; C03B2203/10; C03B2203/18; C03B2203/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
An infrared optical fiber comprising a core for transmitting infrared light; a cladding being preassembled around said core with radial clearance in a coiled configuration and then tensioned to radially constrict the cladding into coiled engagement with the core; and a protective tube which jackets said core and said cladding coiled thereon.
Claim 2
Dependent Claim
52 words
An infrared optical fiber comprising a core for transmitting infrared light; a cladding being preassembled around said core with radial clearance in a coiled configuration and then tensioned to radially constrict the cladding into coiled engagement with the core; and a protective tube which jackets said core and said cladding coiled thereon.
Claim 3
Dependent Claim
59 words
An infrared optical fiber as set forth in claim 1, wherein said cladding is preshaped by helically winding it around a rod form having a diameter larger than the diameter of said core to provide said cladding upon removal of the rod form with a helically coiled configuration having a free diameter larger than the diameter of the core.
Claim 4
Dependent Claim
23 words
An infrared optical fiber as set forth in claim 1 wherein said cladding has a refractive index lower than that of said core.
Claim 5
Independent Claim
80 words
A method of manufacturing an infrared optical fiber comprising the steps of winding a cladding material around a removable rod form having a diameter larger than that of a core to provide a coiled cladding having a free diameter larger than that of said core, inserting the core into the coiled cladding, extending the coiled cladding by pulling its end or ends to constrict the inner diameter of the coiled cladding and jacketing the cladded core with a polymer tube.
Claim 6
Independent Claim
80 words
A method of manufacturing an infrared optical fiber comprising the steps of winding a cladding material around a removable rod form having a diameter larger than that of a core to provide a coiled cladding having a free diameter larger than that of said core, inserting the core into the coiled cladding, extending the coiled cladding by pulling its end or ends to constrict the inner diameter of the coiled cladding and jacketing the cladded core with a polymer tube.
Claim 7
Dependent Claim
28 words
A method as set forth in claim 4 wherein the step of winding the coiled cladding includes disposing said cladding in a helical configuration about said rod form.
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) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |