Patent US4320981A successfully refreshed from Google Patents.
US3399313A
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US
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Photoparametric amplifier diode
Assignee: Unisys Corp
•
Filing: 1965-04-07
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Granted: 1968-08-27
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Expires: 1985-04-07
Abstract
No abstract record available.
Inventors
- 👤 David E Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:33
CPC Classifications
H; H03; H03F; H03F7/00; H10; H10D; H10D99/00; H10F; H10F99/00; H03F2200/00; H03F2200/372
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2986591A
Cited
US3043959A
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US3192398A
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US3196327A
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US3229106A
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US3170067A
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US3265899A
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US3245002A
Cited
US3267294A
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US3283160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |