US2862691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coring bit assembly
Assignee: Jersey Production Research Co
•
Filing: 1956-04-03
•
Granted: 1958-12-02
•
Expires: 1976-04-03
Abstract
No abstract record available.
Inventors
- 👤 Clyde D Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:46
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2073877A
Cited
US2146263A
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US2264449A
Cited
US2615680A
Cited
US2587231A
Cited
US2703697A
Cited
FR1107204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |