Patent US2579453A successfully refreshed from Google Patents.
US2579453A
Expired / Lapsed
US
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Composition for drilling muds
Assignee: Wyeth Holdings LLC
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Filing: 1947-01-31
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Granted: 1951-12-25
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Expires: 1967-01-31
Abstract
No abstract record available.
Inventors
- 👤 Earl E Post
- 👤 Wilbur N Oldham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:17
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A DRILLING FLUID COMPRISING ANAQUEOUS CLAY DISPERSION CONTAINING, AS A WATER LOSS-CONTROLLING AGENT, A COLD WATER-SOLUBLE CONDENSATION PRODUCT OBTAINED BY CONDENSING AT LEAST THREE MOLAR EQUIVALENTS OF A NATURAL COLD WATER-INSOLUBLE QUEBRACHO, BASED ON THE DIGALLOYL GLUCOSE CONTENT THEREOF, WITH A QUANTITY OF FORMALDEHYDE WHICH IS LESS THAN 1 MOL BUT SUFFICIENT TO FORM A COLD WATER-SOLUBLE CONDENSATION PRODUCT, THE CONDENSATION BEING CARRIED OUT IN AQUEOUS SOLUTION AT A TEMPERATURE OF ABOUT 70-80* C. AND A PH OF AT LEAST 8.
Claim 2
Dependent Claim
81 words
A DRILLING FLUID COMPRISING ANAQUEOUS CLAY DISPERSION CONTAINING, AS A WATER LOSS-CONTROLLING AGENT, A COLD WATER-SOLUBLE CONDENSATION PRODUCT OBTAINED BY CONDENSING AT LEAST THREE MOLAR EQUIVALENTS OF A NATURAL COLD WATER-INSOLUBLE QUEBRACHO, BASED ON THE DIGALLOYL GLUCOSE CONTENT THEREOF, WITH A QUANTITY OF FORMALDEHYDE WHICH IS LESS THAN 1 MOL BUT SUFFICIENT TO FORM A COLD WATER-SOLUBLE CONDENSATION PRODUCT, THE CONDENSATION BEING CARRIED OUT IN AQUEOUS SOLUTION AT A TEMPERATURE OF ABOUT 70-80* C. AND A PH OF AT LEAST 8.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |