Patent US2481639A successfully refreshed from Google Patents.
US2481639A
Expired / Lapsed
US
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High-aperture copying lens system
Assignee: Eastman Kodak Co
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Filing: 1945-08-23
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Granted: 1949-09-13
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Expires: 1965-08-23
Abstract
No abstract record available.
Inventors
- 👤 Fred E Altman
- 👤 Charles J Melech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:13
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB168923A
Cited
US1945977A
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US1783998A
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US2019985A
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US2012822A
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US2354614A
Cited
US2298853A
Cited
US2319171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |