Patent US2687375A successfully refreshed from Google Patents.
US2687375A
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Drilling fluids
Assignee: Union Oil Company of California
•
Filing: 1949-10-01
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Granted: 1954-08-24
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Expires: 1969-10-01
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
- 👤 Raymond A Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A DRILLING FLUID WHICH COMPRISES WATER, A SUSPENDED CLAY, BETWEEN 0.01% AND 10% BY WEIGHT OF A SOAP SELECTED FROM THE CLASS CONSISTING OF THE ALKALI METAL AND AMMONIUM SOAPS OF CARBOXYLIC ACIDS CONTAINING MORE THAN ABOUT TEN CARBON ATOMS AND OIL-SOLUBLE SOLFONIC ACIDS, AND BETWEEN ABOUT 0.01% AND 10% BY WEIGH OF A WATER-SOLUBLE HYDROXYALKYL CELLULOSE ETHER IN WHICH THE HYDROXYALKYL SUBSTITUENT GROUPS EACH CONTAIN AT LEAST 2 CARBON ATOMS.
Claim 2
Dependent Claim
71 words
A DRILLING FLUID WHICH COMPRISES WATER, A SUSPENDED CLAY, BETWEEN 0.01% AND 10% BY WEIGHT OF A SOAP SELECTED FROM THE CLASS CONSISTING OF THE ALKALI METAL AND AMMONIUM SOAPS OF CARBOXYLIC ACIDS CONTAINING MORE THAN ABOUT TEN CARBON ATOMS AND OIL-SOLUBLE SOLFONIC ACIDS, AND BETWEEN ABOUT 0.01% AND 10% BY WEIGH OF A WATER-SOLUBLE HYDROXYALKYL CELLULOSE ETHER IN WHICH THE HYDROXYALKYL SUBSTITUENT GROUPS EACH CONTAIN AT LEAST 2 CARBON ATOMS.
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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) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |