Patent US2620909A successfully refreshed from Google Patents.
US2620909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hoist drum control
Assignee: Western Oil Tool & Engineering
•
Filing: 1947-11-17
•
Granted: 1952-12-09
•
Expires: 1967-11-17
Abstract
No abstract record available.
Inventors
- 👤 Moon James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:21
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/02; B66D1/14; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0158; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86509; Y10T137/87056; Y10T137/87064; Y10T137/87072; Y10T74/00; Y10T74/20; Y10T74/20012
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2314842A
Cited
US2329742A
Cited
US1711896A
Cited
US2336715A
Cited
GB569136A
Cited
US2426064A
Cited
US2395180A
Cited
US2388357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |