US2717875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlling viscosity of drilling fluids
Assignee: Texaco Inc
•
Filing: 1952-07-01
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Granted: 1955-09-13
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Expires: 1972-07-01
Abstract
No abstract record available.
Inventors
- 👤 Walter J Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:26
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
57 words
A DRILLING FLUID COMPRISING AN AQUEOUS SUSPENSION OF CLAY WHICH IS RESPONSIVE TO VISCOSITY CONTROL BY MEANS OF QUEBRACHO EXTRACT, SAID FLUID CONTAINING A VISCOSITY REDUCING AGENT OF THE CLASS CONSISTING OF PYRUVIC ACID AND ITS WATER SOLUBLE ALKALI METAL AND ALKALINE EARTH METAL SALTS, IN AN AMOUNT SUFFICIENT TO REGULATE THE VISCOSITY OF SAID DRILLING FLUID.
Claim 2
Dependent Claim
57 words
A DRILLING FLUID COMPRISING AN AQUEOUS SUSPENSION OF CLAY WHICH IS RESPONSIVE TO VISCOSITY CONTROL BY MEANS OF QUEBRACHO EXTRACT, SAID FLUID CONTAINING A VISCOSITY REDUCING AGENT OF THE CLASS CONSISTING OF PYRUVIC ACID AND ITS WATER SOLUBLE ALKALI METAL AND ALKALINE EARTH METAL SALTS, IN AN AMOUNT SUFFICIENT TO REGULATE THE VISCOSITY OF SAID DRILLING FLUID.
References Cited (Backward Citations)
US2477157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |