Patent US2726207A successfully refreshed from Google Patents.
US2726207A
Expired / Lapsed
US
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Drilling fluid containing water-soluble silicones
Assignee: Shell Development Co
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Filing: 1954-04-13
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Granted: 1955-12-06
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Expires: 1974-04-13
Abstract
No abstract record available.
Inventors
- 👤 Healey Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:02
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
44 words
A WATER-BASE DRILLING MUD COMPRISING AN AQUEOUS FLUID MIXTURE HAVING A PH NO GREATER THAN 12 CONTAINING SUSPENDED INORGANIC SOLIDS WHICH FORM A FILTER CAKE ON THE WALL OF A WELL, AND FROM 0.1% TO 5% BY WEIGHT OF AN ALKALINE METAL HYDROCARBON SILICONATE.
Claim 2
Dependent Claim
44 words
A WATER-BASE DRILLING MUD COMPRISING AN AQUEOUS FLUID MIXTURE HAVING A PH NO GREATER THAN 12 CONTAINING SUSPENDED INORGANIC SOLIDS WHICH FORM A FILTER CAKE ON THE WALL OF A WELL, AND FROM 0.1% TO 5% BY WEIGHT OF AN ALKALINE METAL HYDROCARBON SILICONATE.
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) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |