US2570947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluids and methods of using same
Assignee: Phillips Petroleum Co
•
Filing: 1945-11-05
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Granted: 1951-10-09
•
Expires: 1965-11-05
Abstract
No abstract record available.
Inventors
- 👤 Chester M Himel
- 👤 Edison G Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:06
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
70 words
A WATER BASE WELL DRILLING MUD COMPRISING IN COMBINATION SUFFICIENT WATER TO MAINTAIN THE MUD AS A FLUID CLAYEY MATERIAL TO FORM A FILTER CAKE ON THE WALL OF THE WELL, AND A WATER SOLUBLE HYDROXYALKYLCELLULOSE IN AN AMOUNT SUFFICIENT TO REDUCE THE WATER LOSS DUE TO FILTRATION THROUGH SAID FILTER CAKE WITHOUT INCREASING THE VISCOSITY OF SAID WELL DRILLING MUD TO SUCH AN EXTENT THAT IT CANNOT BE CIRCULATED.
References Cited (Backward Citations)
US2184564A
Cited
US2129913A
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US2336171A
Cited
US2364434A
Cited
US2337296A
Cited
US2425768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |