US2895669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical treatment of drilling muds
Assignee: Phillips Petroleum Co
•
Filing: 1954-09-13
•
Granted: 1959-07-21
•
Expires: 1974-09-13
Abstract
No abstract record available.
Inventors
- 👤 Roy A Bobo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:15
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/063; E21B21/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US981680A
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US2156333A
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US2311606A
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US2576283A
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US2679974A
Cited
US2720358A
Cited
US2779536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |