US2644670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible drill bit and cutter blade
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1950-10-30
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Granted: 1953-07-07
•
Expires: 1970-10-30
Abstract
No abstract record available.
Inventors
- 👤 John R Baker
- 👤 Jr Earnest H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:44
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/322
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1510222A
Cited
US1597143A
Cited
GB330433A
Cited
US2019934A
Cited
US1857616A
Cited
US1923488A
Cited
GB552382A
Cited
US2348262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |