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US2889741A
Expired / Lapsed
US
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Photographic enlarger with automatic focus
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1957-04-17
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Granted: 1959-06-09
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Expires: 1977-04-17
Abstract
No abstract record available.
Inventors
- 👤 Luz Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:55
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/34; G03B27/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1623538A
Cited
US2043970A
Cited
US2123510A
Cited
DE706640C
Cited
US2233744A
Cited
FR1032561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |