US2644673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible rotary drill bit and cutter
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1949-09-26
•
Granted: 1953-07-07
•
Expires: 1969-09-26
Abstract
No abstract record available.
Inventors
- 👤 John R Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:30
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/322
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1483611A
Cited
US1973657A
Cited
US1821474A
Cited
US1887895A
Cited
US1923488A
Cited
US1923487A
Cited
US1992546A
Cited
US2057209A
Cited
US2337322A
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 |