US3397751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asymmetric three-cone rock bit
Assignee: ConocoPhillips Co
•
Filing: 1966-03-02
•
Granted: 1968-08-20
•
Expires: 1986-03-02
Abstract
No abstract record available.
Inventors
- 👤 Donald R Reichmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:02
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2057026A
Cited
US2104820A
Cited
US2148372A
Cited
US2107626A
Cited
US2184067A
Cited
US2915291A
Cited
US3265139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |