US1918223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine lamp
Assignee: Koehler Manufacturing Co
•
Filing: 1931-04-18
•
Granted: 1933-07-11
•
Expires: 1951-04-18
Abstract
No abstract record available.
Inventors
- 👤 Wheat Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:47
CPC Classifications
F; F21; F21V; F21V25/00; F21V15/00; F21V15/02; F21V21/00; F21V21/08; F21V27/00; F21V27/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1936-07-10 | 1937-01-09 | 1937-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-07-10 | 1941-01-09 | 1941-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-07-10 | 1945-01-09 | 1945-07-11 | $7700.00 | Window Closed / Lapsed |