US3577094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fresnel zone laser coupling mirror
Assignee: RTX Corp
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Filing: 1968-09-27
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Granted: 1971-05-04
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Expires: 1988-09-27
Abstract
Abstract A laser cavity includes a spherical mirror and a flat mirror, the flat mirror having a plurality of holes arranged in a Fresnel zone pattern so as to provide distributed output coupling having a near-field focal point; alternatively, the flat mirror may comprise a pattern of reflecting material on a light-transmissive medium.
Inventors
- 👤 Richard G Tomlinson
- 👤 Clyde O Brown
- 👤 Alan F Haught
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:56
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08059; H01S3/08068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3136959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |