Patent US2931857A successfully refreshed from Google Patents.
US2931857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television reconnaissance system
Assignee: Individual
•
Filing: 1955-09-23
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Granted: 1960-04-05
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Expires: 1975-09-23
Abstract
No abstract record available.
Inventors
- 👤 Jr John Hays Hammond
- 👤 Chaffee Emory Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
G; G01; G01C; G01C11/00; G01C11/02; G01C11/025; H; H04; H04N; H04N7/00; H04N7/002; H04N7/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2239489A
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US2275898A
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US2373114A
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US2402053A
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US2381902A
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US2419024A
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US2436516A
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US2525891A
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US2622147A
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US2709716A
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US2798116A
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US2798115A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |