US2491072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Schmidt television projector with spherical aberration corrector
Assignee: Rauland Borg Corp
•
Filing: 1945-06-19
•
Granted: 1949-12-13
•
Expires: 1965-06-19
Abstract
No abstract record available.
Inventors
- 👤 James G Baker
- 👤 Constantin S Szegho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:58
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0888
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB487241A
Cited
GB477406A
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US2170979A
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US2229302A
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US2273801A
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US2344756A
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US2298808A
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FR883937A
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US2305855A
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GB557771A
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US2440735A
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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) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |