US2575121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic shutter with built-in flash synchronizer
Assignee: WOLLENSAK OPTICAL CO
•
Filing: 1947-11-21
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Granted: 1951-11-13
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Expires: 1967-11-21
Abstract
No abstract record available.
Inventors
- 👤 Pirwitz Friedrich A Gustav
- 👤 Pirwitz Gustave Paul
- 👤 Jack H Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:40
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1968597A
Cited
US2049735A
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US2145917A
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US2282850A
Cited
US2358941A
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US2404526A
Cited
US2405741A
Cited
US2474378A
Cited
US2502668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |