US2011929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric supply for lamps in coal mines and like places
Assignee: Individual
•
Filing: 1932-10-28
•
Granted: 1935-08-20
•
Expires: 1952-10-28
Abstract
No abstract record available.
Inventors
- 👤 Cramp William
- 👤 Searby Norman Halifax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:32
CPC Classifications
F; F21; F21V; F21V23/00; F21V23/02; F21V25/00; F21V25/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-08-19 | 1939-02-18 | 1939-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-08-19 | 1943-02-18 | 1943-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-08-19 | 1947-02-18 | 1947-08-20 | $7700.00 | Window Closed / Lapsed |