US2768693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing the loss of drilling mud
Assignee: Individual
•
Filing: 1954-08-06
•
Granted: 1956-10-30
•
Expires: 1974-08-06
Abstract
No abstract record available.
Inventors
- 👤 Jr James R Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:13
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/134
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2167191A
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US2368424A
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US2609880A
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US2504462A
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US2573690A
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US2699212A
Cited
US2708973A
Cited
US2648522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |