US2650796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawworks feed control
Assignee: National Supply Co
•
Filing: 1948-02-09
•
Granted: 1953-09-01
•
Expires: 1968-02-09
Abstract
No abstract record available.
Inventors
- 👤 James G Abraham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:49
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084; Y; Y10; Y10S; Y10S254/00; Y10S254/903; Y10S60/00; Y10S60/905; Y10S60/907
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US710758A
Cited
US710759A
Cited
US2079841A
Cited
US2126189A
Cited
US2185435A
Cited
US2197819A
Cited
US2298222A
Cited
US2488070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |