Patent US2974840A successfully refreshed from Google Patents.
US2974840A
Expired / Lapsed
US
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Motion picture projector
Assignee: Kamera und Kinowerke Dresden VEB
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Filing: 1957-10-24
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Granted: 1961-03-14
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Expires: 1977-10-24
Abstract
No abstract record available.
Inventors
- 👤 Kuhnert Rudolf
- 👤 Stuhmke Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:52
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US740318A
Cited
US986857A
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US1018827A
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US1277195A
Cited
US1942231A
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US2505965A
Cited
GB653121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |