US2477331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image projection lens and mirror system with spherical aberration correction means
Assignee: RCA Corp
•
Filing: 1944-09-27
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Granted: 1949-07-26
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Expires: 1964-09-27
Abstract
No abstract record available.
Inventors
- 👤 David W Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:38
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0856; G02B17/086; G02B17/0804; G02B17/0808; G02B17/0884; G02B17/0888
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US929795A
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US2097494A
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US2215900A
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US2306679A
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US2336379A
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US2295779A
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US2344756A
Cited
US2295802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |