Patent US4088388A successfully refreshed from Google Patents.
US4088388A
Expired / Lapsed
US
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O-Type optical waveguide
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1976-07-26
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Granted: 1978-05-09
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Expires: 1996-07-26
Abstract
Abstract An O-type optical waveguide comprising a rod of fused silica having formed thereon a layer of doped fused silica having an index of refraction which is greater than that of the rod, and an outside layer of fused silica over the layer of doped fused silica. The surfaces between of doped silica, having the higher refractive index, and the low adjacent layers between which it lies are extremely smooth and clean or free from foreign particles thereby preventing scattering loss due to the inclusion of foreign particles.
Inventors
- 👤 Tsuneo Nakahara
- 👤 Masao Hoshikawa
- 👤 Satoshi Shiraishi
- 👤 Shiro Kurosaki
- 👤 Kunio Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:22
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/027; C03B37/02754; C03B37/012; C03B37/01205; C03B37/01211; C03B37/014; C03B37/01413; C03B37/018; C03B37/01807; G; G02; G02B; G02B6/00; G02B6/02; B; B29; B29C; B29C2791/00; B29C2791/001; B29C43/00; B29K; B29K2067/00; B29K2067/06; B29K2101/00; B29K2101/10; B29K2101/12; B29K2105/00; B29K2105/06; B29K2105/24; C03B2201/00; C03B2201/02; C03B2201/06; C03B2201/30; C03B2201/31; C03B2201/32; C03B2201/34; C03B2201/40; C03B2201/42; C03B2201/50; C03B2203/00; C03B2203/10; C03B2203/22; C03B2205/00; C03B2205/12; C03B2205/14; C03B2205/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
55 words
An optical waveguide comprising a rod of fused silica having formed thereon a layer of doped fused silica having an index of refraction which is greater than that of said rod, and an outside layer of fused silica over said layer of doped fused silica the surfaces between said layers being extremely smooth and clean.
Claim 2
Dependent Claim
55 words
An optical waveguide comprising a rod of fused silica having formed thereon a layer of doped fused silica having an index of refraction which is greater than that of said rod, and an outside layer of fused silica over said layer of doped fused silica the surfaces between said layers being extremely smooth and clean.
Claim 3
Dependent Claim
27 words
The optical waveguide of claim 1 including a layer of undoped fused silica disposed between the surfaces of said rod and said layer of doped fused silica.
References Cited (Backward Citations)
US3877912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |