US3586640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Far-infrared photodetector
Assignee: United States Department of the Navy
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Filing: 1968-04-24
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Granted: 1971-06-22
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Expires: 1988-04-24
Abstract
Abstract A NEW CLASS OF SEMICONDUCTOR PHOTODETECTORS ARE FABRICATED BY DOPING IONIC SINGLE CRYSTALS WITH RARE-EARTH DOPANTS. WHEN THESE DOPED CRYSTALS ARE COOLED AND A POTENTIAL IS APPLIED ACROSS THE CRYSTAL, IT FUNCTION AS AN IMAGE CONVERTER, CONVERTING INCIDENT INFRARED RADIATION INTO VISIBLE COMPONENTS.
Inventors
- 👤 Peter S Pershan
- 👤 Peter Eisenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:38
CPC Classifications
H; H10; H10F; H10F55/00; H10F55/10; H10F30/00; H10F30/10
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |