Patent US2531936A successfully refreshed from Google Patents.
US2531936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera shutter mechanism
Assignee: POLARQID Corp
•
Filing: 1947-02-07
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Granted: 1950-11-28
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Expires: 1967-02-07
Abstract
No abstract record available.
Inventors
- 👤 Murry N Fairbank
- 👤 Sidney B Whittier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:39
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US798595A
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US1124313A
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US1032297A
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US1391790A
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US1701121A
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US1963324A
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US1925567A
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US1966313A
Cited
US2176621A
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US2340573A
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US2315279A
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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) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |