Patent US3025235A successfully refreshed from Google Patents.
US3025235A
Expired / Lapsed
US
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Fluid loss control agent for drilling muds
Assignee: Rayonier Inc
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Filing: 1958-07-17
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Granted: 1962-03-13
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Expires: 1978-07-17
Abstract
No abstract record available.
Inventors
- 👤 Norman H Smith
- 👤 Gray Kenneth Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:38
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
120 words
AN AQUEOUS DRILLING MUD COMPRISING AN HYDRATABLE CLAY DISPERSED IN WATER AND ABOUT ONE-HALF TO TEN POUNDS PER BARREL OF A FLUID LOSS CONTROL PRODUCT WHICH IS FORMED BY HEATING CONCENTRATED SPENT SULFITE DIGESTION LIQUOR CONTAINING FROM 20% TO 50% OF DISSOLVED SOLIDS IN THE PRESENCE OF AMMONIUM IONS EQUIVALENT TO FROM 1 TO 10% OF AMMONIA AT A PH OF FROM 1 TO 9, AT A TEMPERATURE OF FROM 150* TO 275*C. FOR FROM 4 TO 180 MINUTES, SAID PRODUCT HAVING A VISCOSITY IN EXCESS OF 100,000 CENTIPOISES MEASURED AT 25*C. AND 23 PERCENT TOTAL SOLIDS AND WHICH IS SOLUBLE IN DILUTE SODIUM HYDROXIDE SOLUTIONS, SAID PRODUCT BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE FLUID LOSS VERY SUBSTANTIALLY.
Claim 2
Dependent Claim
120 words
AN AQUEOUS DRILLING MUD COMPRISING AN HYDRATABLE CLAY DISPERSED IN WATER AND ABOUT ONE-HALF TO TEN POUNDS PER BARREL OF A FLUID LOSS CONTROL PRODUCT WHICH IS FORMED BY HEATING CONCENTRATED SPENT SULFITE DIGESTION LIQUOR CONTAINING FROM 20% TO 50% OF DISSOLVED SOLIDS IN THE PRESENCE OF AMMONIUM IONS EQUIVALENT TO FROM 1 TO 10% OF AMMONIA AT A PH OF FROM 1 TO 9, AT A TEMPERATURE OF FROM 150* TO 275*C. FOR FROM 4 TO 180 MINUTES, SAID PRODUCT HAVING A VISCOSITY IN EXCESS OF 100,000 CENTIPOISES MEASURED AT 25*C. AND 23 PERCENT TOTAL SOLIDS AND WHICH IS SOLUBLE IN DILUTE SODIUM HYDROXIDE SOLUTIONS, SAID PRODUCT BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE FLUID LOSS VERY SUBSTANTIALLY.
References Cited (Backward Citations)
US2491436A
Cited
US2674575A
Cited
US2831022A
Cited
US2822358A
Cited
US2935504A
Cited
US2858271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-12 | 1965-09-11 | 1966-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-12 | 1969-09-11 | 1970-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-12 | 1973-09-11 | 1974-03-13 | $7700.00 | Window Closed / Lapsed |