Patent US3681608A successfully refreshed from Google Patents.
US3681608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser beam receiver having a high signal to noise ratio
Assignee: United States Department of the Navy
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Filing: 1971-03-17
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Granted: 1972-08-01
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Expires: 1991-03-17
Abstract
Abstract A receiver in a weapon fire simulator system including a gallium arsenide laser utilizes a relatively narrow band-pass filter whose spectral transmittance peaks in the spectral region corresponding to the spectral emission of the gallium arsenide laser operating at the highest expected ambient operation temperature. The filter is rotated about an axis perpendicular to the propagation direction of the transmitted radiation by thermally responsive means so that shifts in peak transmission wavelength tend to track changes in spectral emission of the laser.
Inventors
- 👤 George Derderian
- 👤 Denis R Breglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:36
CPC Classifications
F; F41; F41J; F41J5/00; F41J5/02; F41G; F41G3/00; F41G3/26; F41G3/2616; F41G3/2622; F41G3/2655; G; G01; G01S; G01S7/00; G01S7/48; G01S7/483
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
18 words
A receiver as defined in claim 1, and wherein: said filter means comprises a multi-layer, dielectric interference filter.
Claim 2
Dependent Claim
17 words
A receiver as defined in claim 2 and wherein: said thermally responsive means comprises a bimetal element.
Claim 3
Dependent Claim
17 words
A receiver as defined in claim 3, and wherein: said laser means comprises a gallium arsenide laser.
Claim 4
Dependent Claim
17 words
A receiver as defined in claim 3, and wherein: said photo-diode means comprises a silicon diode element.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |