Patent US2582323A successfully refreshed from Google Patents.
US2582323A
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Rotary drilling fluids
Assignee: Union Oil Company of California
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Filing: 1948-02-13
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Granted: 1952-01-15
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Expires: 1968-02-13
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:54
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26; C09K8/28; C09K8/32; C09K8/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
55 words
A DRILLING FLUID WHICH COMPRISES A STABLE SALT-CONTAINING OIL IN WATER EMULSION CONTAINING BETWEEN ABOUT 0.1% AND ABOUT 10.0% BY WEIGHT OF AN ALKALINE EARTH METAL SALT, BETWEEN ABOUT 0.1% AND ABOUT 10.0% BY WEIGHT OF A WATERDISPERSIBLE ALKOXY DERIVATIVE OF CELLULOSE, AND FROM ABOUT 5.0% TO ABOUT 80.0% BY VOLUME OF A HYDROCARBON OIL.
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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) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |