Patent US4165152A successfully refreshed from Google Patents.
US4165152A
Expired / Lapsed
US
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Process for producing optical transmission fiber
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1977-08-22
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Granted: 1979-08-21
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Expires: 1997-08-22
Abstract
Abstract A process for producing an optical transmission fiber is provided which comprises feeding highly pure halides, hydrides or organic compounds of Si and B by way of carrier gas on the outer surface of a fused silica rod or a fused silica pipe, or inner surface of a fused silica pipe, oxidizing them and depositing the products to form a pure fused silica layer or a doped fused silica layer containing B 2 O 3 , melting the pipe and the deposited layer followed by a spinning. The SiO 2 layer can alternatively contain fluorine instead of B 2 O 3 . A further SiO 2 layer can be deposited thereon to improve the spinning processability and lower the index of refraction of the B 2 O 3 containing layer.
Inventors
- 👤 Satoshi Shiraishi
- 👤 Kunio Fujiwara
- 👤 Shiro Kurosaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:21
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; B; B29; B29D; B29D11/00; B29D11/00663; C03B; C03B23/00; C03B23/20; C03B23/207; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; C03B37/01211; C03B37/014; C03B37/01413; C03B37/01446; C03B37/018; C03B37/01807; C03B37/02; C03B37/025; C03B37/027; G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03605; G02B6/03611; G02B6/03616; G02B6/03622; G02B6/03627; C03B2201/00; C03B2201/02; C03B2201/06; C03B2201/08; C03B2201/10; C03B2201/12; C03B2203/00; C03B2203/10; C03B2203/14; C03B2203/16; C03B2203/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
A tubular optical transmission fiber wherein the refractive index varies between the periphery and the central longitudinal axis of the fiber, said variation being symmetrical with respect to the central longitudinal axis of said fiber, said fiber comprising an inner cavity, an outer radial portion being a lower refractive index portion being made of dope fused silica containing B 2 O 3 , said doped fused silica consisting essentially of SiO 2 and B 2 O 3 and an inner radial portion being a higher refractive index portion being made mainly of pure fused silica consisting essentially of SiO 2 .
Claim 2
Dependent Claim
101 words
A tubular optical transmission fiber wherein the refractive index varies between the periphery and the central longitudinal axis of the fiber, said variation being symmetrical with respect to the central longitudinal axis of said fiber, said fiber comprising an inner cavity, an outer radial portion being a lower refractive index portion being made of dope fused silica containing B 2 O 3 , said doped fused silica consisting essentially of SiO 2 and B 2 O 3 and an inner radial portion being a higher refractive index portion being made mainly of pure fused silica consisting essentially of SiO 2 .
Claim 3
Dependent Claim
21 words
The tubular optical transmission fiber of claim 1, wherein a further fused silica or water-repellent glass is deposited on said fiber.
Claim 4
Dependent Claim
25 words
The tubular optical transmission fiber of claim 1, wherein the cavity within said inner radial portion of said tube is filled with doped fused silica.
Claim 5
Dependent Claim
21 words
The tubular optical transmission fiber of claim 3, wherein a further fused silica or water-repellent glass is deposited on said fiber.
Claim 6
Dependent Claim
25 words
The tubular optical transmission fiber of claim 3, wherein said doped fused silica within said cavity of said tube contains B 2 O 3 .
Claim 7
Dependent Claim
21 words
The tubular optical transmission fiber of claim 5, wherein a further fused silica or water-repellent glass is deposited on said fiber.
Claim 8
Dependent Claim
103 words
An optical transmission fiber wherein the refractive index varies between the periphery and the central longitudinal axis of the fiber, said variation being symmetrical with respect to the central longitudinal axis of said fiber, said fiber having at least one higher retractive index portion being made mainly of pure fused silica consisting essentially of SiO 2 and at least one lower refractive index portion being made of doped fused silica containing B 2 O 3 , said doped fused silica consisting essentially of SiO 2 and B 2 O 3 and an outermost layer of a fused silica or a water-repellent glass layer.
Claim 9
Dependent Claim
103 words
An optical transmission fiber wherein the refractive index varies between the periphery and the central longitudinal axis of the fiber, said variation being symmetrical with respect to the central longitudinal axis of said fiber, said fiber having at least one higher retractive index portion being made mainly of pure fused silica consisting essentially of SiO 2 and at least one lower refractive index portion being made of doped fused silica containing B 2 O 3 , said doped fused silica consisting essentially of SiO 2 and B 2 O 3 and an outermost layer of a fused silica or a water-repellent glass layer.
Claim 10
Dependent Claim
18 words
The optical transmission fiber of claim 7 wherein the innermost portion of said fiber is pure fused silica.
Claim 11
Dependent Claim
46 words
The optical transmission fiber of claim 7 wherein the innermost portion of said fiber is pure fused silica and the content of the B 2 O 3 is radially changed in order to obtain a parabolic gradient of the radial distribution of the index of refraction.
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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |