US2737797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply unit for photographic flashlights
Assignee: Individual
•
Filing: 1951-08-31
•
Granted: 1956-03-13
•
Expires: 1971-08-31
Abstract
No abstract record available.
Inventors
- 👤 Clarence M Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:03
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32; F; F21; F21K; F21K5/00; F21K5/02; F21K5/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2324075A
Cited
US2546734A
Cited
US2584858A
Cited
US2553662A
Cited
US2646672A
Cited
US2664795A
Cited
US2590069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |