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US2989893A
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Dual-drive focusing system for cameras
Assignee: Robertson Photo-Mechanix Inc
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Filing: 1958-06-02
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Granted: 1961-06-27
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Expires: 1978-06-02
Abstract
No abstract record available.
Inventors
- 👤 Wanielista Walter
- 👤 Jr Leonard S Florsheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:28
CPC Classifications
G; G03; G03B; G03B3/00; Y; Y10; Y10T; Y10T82/00; Y10T82/25; Y10T82/2531; Y10T82/2537; Y10T82/2539
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1525798A
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US1846972A
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US2150974A
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US2420023A
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US2506347A
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US2690696A
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US2655834A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |