Patent US2542020A successfully refreshed from Google Patents.
US2542020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid compositions
Assignee: Union Oil Company of California
•
Filing: 1949-07-15
•
Granted: 1951-02-20
•
Expires: 1969-07-15
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:38
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A DRILLING FLUID COMPOSITION PREPARED BY DISPERSING IN A MINERAL OIL; BETWEEN ABOUT 0.1 AND ABOUT 5 PER CENT BY WEIGHT OF A HYDRATABLE CLAY; BETWEN ABOUT 0.1 AND ABOUT 5 PER CENT BY WEIGHT OF AN ALKALINE-EARTH METAL BASE; BETWEEN ABOUT 0.2 AND ABOUT 10 PER CENT BY WEIGHT OF WATER; AND BETWEEN ABOUT 0.2 AND ABOUT 10 PER CENT BY WEIGHT OF A SAPONIFICATION PRODUCT OBTAINED BY SAPONIFYING WITH AN AQUEOUS ALKALI-METAL ALKALI A WOOD ROSIN WHICH HAS BEEN HEAT-TREATED UNDER CONDITIONS OF TIME AND TEMPERATURE SUFFICIENT TO RAISE ITS SPECIFIC ROTATION TO A VALUE ABOVE ABOUT +5*, SAID SAPONIFICATION PRODUCT CONTAINING BETWEEN ABOUT 1 AND ABOUT 15 PER CENT BY WEIGHT OF FREE RESIN ACID.
Claim 2
Dependent Claim
118 words
A DRILLING FLUID COMPOSITION PREPARED BY DISPERSING IN A MINERAL OIL; BETWEEN ABOUT 0.1 AND ABOUT 5 PER CENT BY WEIGHT OF A HYDRATABLE CLAY; BETWEN ABOUT 0.1 AND ABOUT 5 PER CENT BY WEIGHT OF AN ALKALINE-EARTH METAL BASE; BETWEEN ABOUT 0.2 AND ABOUT 10 PER CENT BY WEIGHT OF WATER; AND BETWEEN ABOUT 0.2 AND ABOUT 10 PER CENT BY WEIGHT OF A SAPONIFICATION PRODUCT OBTAINED BY SAPONIFYING WITH AN AQUEOUS ALKALI-METAL ALKALI A WOOD ROSIN WHICH HAS BEEN HEAT-TREATED UNDER CONDITIONS OF TIME AND TEMPERATURE SUFFICIENT TO RAISE ITS SPECIFIC ROTATION TO A VALUE ABOVE ABOUT +5*, SAID SAPONIFICATION PRODUCT CONTAINING BETWEEN ABOUT 1 AND ABOUT 15 PER CENT BY WEIGHT OF FREE RESIN ACID.
References Cited (Backward Citations)
US2363499A
Cited
US2316967A
Cited
US2356776A
Cited
US2350154A
Cited
US2461483A
Cited
US2430039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |