US3820871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short wavelength waveguides formed of metal oxides
Assignee: Thales SA
•
Filing: 1972-08-10
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Granted: 1974-06-28
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Expires: 1992-08-10
Abstract
Abstract A light waveguide is formed by atomising under vacuum and deposition upon a substrate, of a metal such for example as tantalum, in an atmosphere comprising a gas capable, in association with the metal, of forming a chemical combination, oxygen in the case of tantalum. The deposit is a complex compound of the metal and of the gas if the gas pressure is insufficient to produce the desired chemical combination (tantalum pentoxide Ta2O5); the assembly, after appropriate masking, is subjected to a chemical process which converts the unprotected parts into said combination.
Inventors
- 👤 M Croset
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:59
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/13; G02B6/132; G02B6/122; G02B6/125
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
14 words
A waveguide as claimed in claim 1, wherein said solid element is a metal.
Claim 2
Dependent Claim
54 words
A waveguide as claimed in claim 2, wherein said metal has a higher refractive index than said chemical combination, and said compound has a refractive index which decreases when the proportion of gas in said compound increases, up to the point at which the stoechiometric ratio for the formation of said combination is reached.
Claim 3
Dependent Claim
19 words
A waveguide as claimed in claim 3, wherein said metal is tantalum, the gas oxygen, the combination tantalum pentoxide.
Claim 4
Dependent Claim
20 words
A waveguide as claimed in claim 3, wherein said metal is zirconium the gas oxygen, the combination zirconium oxide ZrO2.
Claim 5
Dependent Claim
21 words
A system of identical waveguides in accordance with claim 2, integrated into one and the same layer of said chemical combination.
Claim 6
Dependent Claim
35 words
A system as claimed in claim 6, comprising two waveguides having parallel rectilinear portions of the same length located opposite one another and separated by an interval in order thus to form a directional coupler.
Claim 7
Dependent Claim
15 words
A waveguide as claimed in claim 1, characterized in that its cross-section is substantially rectangular.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |