US2988145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well bore drilling and cementing apparatus
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1956-12-03
•
Granted: 1961-06-13
•
Expires: 1976-12-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Earnest H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:20
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/143
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1816991A
Cited
US2436525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |