Patent US2679478A successfully refreshed from Google Patents.
US2679478A
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US
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Drilling mud
Assignee: Union Oil Company of California
•
Filing: 1947-01-04
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Granted: 1954-05-25
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Expires: 1967-01-04
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
- 👤 Raymond A Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:10
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A DRILLING FLUID COMPRISING WATER, CLAY, AND BETWEEN ABOUT 331% AND 10% BY WEIGHT OF WATER DISPERSIBLE METHYL CELLULOSE.
Claim 2
Dependent Claim
19 words
A DRILLING FLUID COMPRISING WATER, CLAY, AND BETWEEN ABOUT 331% AND 10% BY WEIGHT OF WATER DISPERSIBLE METHYL CELLULOSE.
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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) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |