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US2468792A
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US
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Drilling fluids and methods of using same
Assignee: Phillips Petroleum Co
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Filing: 1947-08-18
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Granted: 1949-05-03
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Expires: 1967-08-18
Abstract
No abstract record available.
Inventors
- 👤 Cary R Wagner
- 👤 William N Axe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:07
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2129913A
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US2232990A
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US2364434A
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US2256391A
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US2337296A
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US2425768A
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US2399986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-02 | 1952-11-01 | 1953-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-02 | 1956-11-01 | 1957-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-02 | 1960-11-01 | 1961-05-03 | $7700.00 | Window Closed / Lapsed |