US2561418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling muds and methods of use
Assignee: Phillips Petroleum Co
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Filing: 1947-08-18
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Granted: 1951-07-24
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Expires: 1967-08-18
Abstract
No abstract record available.
Inventors
- 👤 Martin A Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:40
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
97 words
A WATER BASE WELL DRILLING MUD COMPRSING IN CONBINATION SUFFICIENT WATER TO MAINTAIN THE MUD AS A FLUID, SUFFICIENT CLAYEY MATERIAL TO FORM A FILTER CAKE ON THE WALL OF THE WELL, AND A WATER SOLUBLE SUBSTITUTED CARBONYYDRATE SELECTED FROM THE GROUP CONSISTING OF WATER SOLUBLE SALTS OF SUBSTITUTED STARCH ACIDS AND INULIN ACIDS AND WATER SOLUBLE SUBSTITUTED STARCH ETHERS AND INULIN ETHERS 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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |