US3070543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low solids drilling fluid
Assignee: Pan American Petroleum Corp
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Filing: 1960-03-25
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Granted: 1962-12-25
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Expires: 1980-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Platho P Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:51
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
AN ADDITIVE FOR INCREASING THE VISCOSITY OF WATER CONSISTING ESSENTIALLY OF A MIXTURE OF MONTMORILLONITIC CLAY AND A WATER-SOLUBLE VINYLMALEIC COPOLYMER, SAID COPOLYMER CONTAINING FROM ABOUT 1 TO ABOUT 1.5 TIMES AS MAY VINYL RADICALS AS MALEIC RADICALS AND BEING POLYMERIZED TO A DEGREE SUCH THAT A 0.4 PERCENT BY WEIGHT AQUEOUS SOLUTION HAS A VISCOSITY OF BETWEEN ABOUT 1 AND ABOUT 3 CENTIPOISES AT 25*C., THE WEIGHT OF SAID CLAY BEING FROM ABOUT 10 TO ABOUT 1000 TIMES THE WEIGHT OF SAID COPOLYMER.
Claim 2
Dependent Claim
84 words
AN ADDITIVE FOR INCREASING THE VISCOSITY OF WATER CONSISTING ESSENTIALLY OF A MIXTURE OF MONTMORILLONITIC CLAY AND A WATER-SOLUBLE VINYLMALEIC COPOLYMER, SAID COPOLYMER CONTAINING FROM ABOUT 1 TO ABOUT 1.5 TIMES AS MAY VINYL RADICALS AS MALEIC RADICALS AND BEING POLYMERIZED TO A DEGREE SUCH THAT A 0.4 PERCENT BY WEIGHT AQUEOUS SOLUTION HAS A VISCOSITY OF BETWEEN ABOUT 1 AND ABOUT 3 CENTIPOISES AT 25*C., THE WEIGHT OF SAID CLAY BEING FROM ABOUT 10 TO ABOUT 1000 TIMES THE WEIGHT OF SAID COPOLYMER.
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) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |