US2727431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic focusing device
Assignee: Robertson Photo-Mechanix Inc
•
Filing: 1952-11-12
•
Granted: 1955-12-20
•
Expires: 1972-11-12
Abstract
No abstract record available.
Inventors
- 👤 Delbert T Blatherwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:30
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)
US1235685A
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US1266111A
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US1651648A
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US1645367A
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US1950166A
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US2134757A
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US2239379A
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US2483147A
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US2464559A
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US2506347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |