US3973828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical wave guide
Assignee: Hitachi Ltd
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Filing: 1974-06-04
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Granted: 1976-08-10
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Expires: 1994-06-04
Abstract
Abstract An optical wave guide comprises a cylindrical body which is made of a first transparent dielectric, and a second transparent dielectric which is concentrically formed on the outer periphery of the cylindrical body and which has an index of refraction lower than that of the first dielectric, the central part of the wave guide being hollow.
Inventors
- 👤 Seiichi Onoda
- 👤 Mitsuo Tanaka
- 👤 Katsuyuki Imoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03605; G02B6/03611; C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/027; G02B6/032; C03B2203/00; C03B2203/10; C03B2203/14; C03B2203/16; C03B2203/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
An optical waveguide through which light transmission is effected, consisting of: a. a hollow cylindrically shaped light transmitting medium having a first prescribed index of refraction and a first prescribed thickness; and b. a layer of light transmitting material surrounding and disposed on the outer surface of said cylindrically shaped light transmitting medium having an index of refraction slightly lower than that of said first index of refraction and a thickness larger than that of said first prescribed thickness.
Claim 2
Dependent Claim
79 words
An optical waveguide through which light transmission is effected, consisting of: a. a hollow cylindrically shaped light transmitting medium having a first prescribed index of refraction and a first prescribed thickness; and b. a layer of light transmitting material surrounding and disposed on the outer surface of said cylindrically shaped light transmitting medium having an index of refraction slightly lower than that of said first index of refraction and a thickness larger than that of said first prescribed thickness.
Claim 3
Dependent Claim
41 words
An optical waveguide according to claim 1, wherein the index of refraction at the boundary between said medium and said layer decreases continuously from said first index continuously in the radial direction across said boundary to said second index of refraction.
Claim 4
Dependent Claim
24 words
An optical waveguide according to claim 1, wherein said medium is made of silicon dioxide and said layer is made of high silica glass.
Claim 5
Dependent Claim
21 words
An optical waveguide according to claim 1, wherein said medium contains a metallic impurity for controlling said first index of refraction.
Claim 6
Dependent Claim
30 words
An optical waveguide according to claim 4, wherein said metallic impurity is an impurity selected from the group consisting of the metallic oxides of Li, P, Ba, Na and Ga.
References Cited (Backward Citations)
US3436141A
Cited
US3434774A
Cited
US3647406A
Cited
US3583786A
Cited
US3711262A
Cited
US3778132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |