Patent US2938440A successfully refreshed from Google Patents.
US2938440A
Expired / Lapsed
US
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Photographic shutter and diaphragm adjusting mechanism
Assignee: Rollei Werke Franke und Heidecke GmbH and Co KG
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Filing: 1959-02-19
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Granted: 1960-05-31
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Expires: 1979-02-19
Abstract
No abstract record available.
Inventors
- 👤 Bretthauer Hermann
- 👤 Rander Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:31
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/04; G03B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2080055A
Cited
US2373391A
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US2467946A
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US2576813A
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US2879702A
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US2887026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |