Patent US3471402A successfully refreshed from Google Patents.
US3471402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid
Assignee: Phillips Petroleum Co
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Filing: 1966-07-25
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Granted: 1969-10-07
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Expires: 1986-07-25
Abstract
No abstract record available.
Inventors
- 👤 James L Shannon
- 👤 Charles A Sauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:40
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
AN AQUEOUS DRILLING FLUID CONTAINING CALIFORNIA ASBESTOS DESIGNATED AS COALINGA ASBESTOS HAVING A SURFACE AREA MORE THAN TWICE THAT OF CANADIAN CHRYSOTILE ASBESTOS AND A WATER-SOLUBLE SALT OF CARBOXYMETHYLCELLULOSE HAVING A DEGREE OF SUBSTITUTION OF ABOUT 0.9 IN AMOUNTS SUFFICIENT TO RAISE THE VISCOSITY OF THE DRILLING FLUID SUBSTANTIALLY, THE ASBESTOS BEING PRESENT IN AN AMOUNT OF AT LEAST ABOUT 0.5 POUND PER BARREL OF DRILLING FLUID AND THE WATER-SOLUBLE SALT BEING PRESENT IN AN AMOUNT OF AT LEAST ABOUT 0.1 POUND PER BARREL OF DRILLIN FLUID.
Claim 2
Dependent Claim
87 words
AN AQUEOUS DRILLING FLUID CONTAINING CALIFORNIA ASBESTOS DESIGNATED AS COALINGA ASBESTOS HAVING A SURFACE AREA MORE THAN TWICE THAT OF CANADIAN CHRYSOTILE ASBESTOS AND A WATER-SOLUBLE SALT OF CARBOXYMETHYLCELLULOSE HAVING A DEGREE OF SUBSTITUTION OF ABOUT 0.9 IN AMOUNTS SUFFICIENT TO RAISE THE VISCOSITY OF THE DRILLING FLUID SUBSTANTIALLY, THE ASBESTOS BEING PRESENT IN AN AMOUNT OF AT LEAST ABOUT 0.5 POUND PER BARREL OF DRILLING FLUID AND THE WATER-SOLUBLE SALT BEING PRESENT IN AN AMOUNT OF AT LEAST ABOUT 0.1 POUND PER BARREL OF DRILLIN FLUID.
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) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |