Patent US2933978A successfully refreshed from Google Patents.
US2933978A
Expired / Lapsed
US
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Electrical control for micro-film projector
Assignee: American Optical Corp
•
Filing: 1955-09-14
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Granted: 1960-04-26
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Expires: 1975-09-14
Abstract
No abstract record available.
Inventors
- 👤 Rosenthal Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:51
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11; G03B21/111
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2450484A
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US2167530A
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US2352077A
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US2404189A
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US2407009A
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US2473736A
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US2610540A
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US2692529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |