US2443744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking mechanism for well drilling rotaries
Assignee: Oil Well Supply Co
•
Filing: 1946-09-20
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Granted: 1948-06-22
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Expires: 1966-09-20
Abstract
No abstract record available.
Inventors
- 👤 Charles L Mohnkern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:15
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; Y; Y10; Y10S; Y10S29/00; Y10S29/086; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1565; Y10T74/1566; Y10T74/1574; Y10T74/21; Y10T74/2133; Y10T74/2136; Y10T74/2137
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) | 1951-06-22 | 1951-12-22 | 1952-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-22 | 1955-12-22 | 1956-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-22 | 1959-12-22 | 1960-06-22 | $7700.00 | Window Closed / Lapsed |