Patent US3825318A successfully refreshed from Google Patents.
US3825318A
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US
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Waveguide coupler having transparent stratified structure with parallel faces
Assignee: Thales SA
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Filing: 1972-08-10
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Granted: 1974-07-23
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Expires: 1992-08-10
Abstract
Abstract An optical structure with parallel faces, has a refractive index decreasing continuously from one face to the other. The structure is produced by reactive cathode sputtering of tantalum in the presence of oxygen. It makes it possible, by refraction, to render parallel light rays which enter at varying angles of incidence.
Inventors
- 👤 M Croset
- 👤 G Velasco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:19
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; G02B6/4206; C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/245; C23; C23C; C23C14/00; C23C14/0021; C23C14/0036; C23C14/0084; G02B1/00; G02B6/26; G02B6/30; G02B6/4202; G02B6/4203; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/218; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/154; C03C2218/155
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
A structure as claimed in claim 1, wherein said other element is a gas.
Claim 2
Dependent Claim
17 words
A structure as claimed in claim 1, wherein said element is tantalum and the combination tantalum oxide.
Claim 3
Dependent Claim
14 words
A structure as claimed in claim 1, wherein the illuminating device produces parallel rays.
Claim 4
Dependent Claim
18 words
A structure as claimed in claim 1, wherein the illuminating device produces a beam of divergent light rays.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |