US2847920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double exposure prevention device for photographic camera
Assignee: GAF Chemicals Corp
•
Filing: 1954-07-02
•
Granted: 1958-08-19
•
Expires: 1974-07-02
Abstract
No abstract record available.
Inventors
- 👤 John K Polhemus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:32
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1271022A
Cited
US2367504A
Cited
US2398412A
Cited
US2544879A
Cited
US2507156A
Cited
GB694571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |