US2729740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermetically sealed flashlight
Assignee: Duracell Inc USA
•
Filing: 1952-01-09
•
Granted: 1956-01-03
•
Expires: 1972-01-09
Abstract
No abstract record available.
Inventors
- 👤 Jerome I Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:59
CPC Classifications
F; F21; F21L; F21L2/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1110110A
Cited
US1971266A
Cited
US2234972A
Cited
US2296287A
Cited
US2385640A
Cited
GB561575A
Cited
US2489806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |