Patent US2465764A successfully refreshed from Google Patents.
US2465764A
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US
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Optical unit with air expansion means
Assignee: RCA Corp
•
Filing: 1945-08-23
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Granted: 1949-03-29
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Expires: 1965-08-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles R Underhill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:46
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/18; G02B7/181; G02B7/1815
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US832219A
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US867982A
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US1175609A
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US1839217A
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US2005068A
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US2037739A
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US2002352A
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US2118716A
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US2164747A
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US2323787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-28 | 1952-09-27 | 1953-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-28 | 1956-09-27 | 1957-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-28 | 1960-09-27 | 1961-03-29 | $7700.00 | Window Closed / Lapsed |