Patent US2947207A successfully refreshed from Google Patents.
Patent US2966059A successfully refreshed from Google Patents.
US2966059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicator of drilling mud gain and loss
Assignee: Warren Automatic Tool Co
•
Filing: 1958-02-10
•
Granted: 1960-12-27
•
Expires: 1978-02-10
Abstract
No abstract record available.
Inventors
- 👤 Ethell J Dower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:55
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1308626A
Cited
US2252367A
Cited
US2290179A
Cited
US2290408A
Cited
US2491606A
Cited
US2691303A
Cited
US2685796A
Cited
US2722122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |