US3081260A
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: 1963-03-12
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Expires: 1980-03-25
Abstract
No abstract record available.
Inventors
- 👤 Park Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
A LOW SOLIDS DRILLING FLUID CONSISTING ESSENTIALLTY OF WATER CONTAINING NO MORE THAN 20,000 PARTS PER MILLION OF CHLORIDE AND SULFATE SALTS, FROM ABOUT 2 TO ABOUT 7 PERCENT BY WEIGHT OF A MONTMORILLONTIC CLAY, AND FROM ABOUT 0.02 TO ABOUT 0.5 POUND PER BARREL OF POLYACRYLAMIDE HYDROLYTES HAVING FROM ABOUT 10 TO ABOUT 120 AMIDE GROUPS FOR EACH CARBOXYL GROUP, THE POLYMERIZATION HAVING BEEN CARRIED TO A DEGREE SUCH THAT A SOLUTION CONTAINING 0.5 PERCENT BY WEIGHT OF THE POLYMER IN DISTILLED WATER HAVING A PH OF 3 TO 3.5 AND A TEMPERATURE OF 21.5*C. HAS A VISCOSITY OF AT LEAST 4 CENTIPOISES AS DETERMINED WITH AN OSTWALD VISCOSIMETER.
References Cited (Backward Citations)
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Cited
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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) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |