Patent US2750816A successfully refreshed from Google Patents.
US2750816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid operated drilling unit
Assignee: —
•
Filing: —
•
Granted: 1956-06-19
•
Expires: 1973-06-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:50
CPC Classifications
B; B23; B23B; B23B45/00; B23B45/04; Y; Y10; Y10S; Y10S408/00; Y10S408/702; Y10T; Y10T408/00; Y10T408/44; Y10T408/65; Y10T408/675; Y10T408/6757
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-19 | 1959-12-19 | 1960-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-19 | 1963-12-19 | 1964-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-19 | 1967-12-19 | 1968-06-19 | $7700.00 | Window Closed / Lapsed |