Patent US2642488A successfully refreshed from Google Patents.
US2642488A
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Schmidt television projector having meniscus to correct for antihalation lens
Assignee: RCA Corp
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Filing: 1949-01-03
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Granted: 1953-06-16
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Expires: 1969-01-03
Abstract
No abstract record available.
Inventors
- 👤 David W Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:02
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0888; H; H04; H04N; H04N5/00; H04N5/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2517774A
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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) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |