US3674337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beam coupling to and from thin film waveguide
Assignee: AT&T Inc
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Filing: 1970-12-07
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Granted: 1972-07-04
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Expires: 1990-12-07
Abstract
Abstract HARNFUL EFFECTS ASSOCIATED WITH IMPERFECTIONS AT THE END OF A THIN FILM OPTICAL WAVEGUIDE ARE AVOIDED IN A COUPLING ARRANGEMENT IN WHICH THE DIELECTRIC WAVEGUIDE STRIP IS TERMINATED INSIDE THE SUBSTRATE. THE EXCITING BEAM IS DIRECTED TOWARDS THE END OF THE GUIDE FROM WITHIN THE SUBSTRATE AT A PREFERRED ANGLE OF INCIDENCE. THE OPTIMUM BEAM ANGLLE IS ALSO SPECIFIED. EXCITATION EFFICIENCIES OF THE ORDER OF 90-97 PERCENT ARE PREDICTED.
Inventors
- 👤 Enrique Alfredo Jose Marcatili
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:11
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/30
Claims Analysis
Total Claims: 0
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |