US2867584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid
Assignee: Atlantic Richfield Co
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Filing: 1955-01-03
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Granted: 1959-01-06
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Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 J O Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
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
58 words
A WATER BASE DRILLING MUD COMPRISING A WATER BASE HAVING DISPERSED THEREIN A MINERAL CLAY, SALT IN AN AMOUNT AT LEAST 20 PERCENT BY WEIGHT OF THE SOLUTION, 1 TO 10 LBS. PER BBL. OF STARCH, AND 1 TO 5 LBS. PER BBL. OF A HYDROLYZED POLYACRYLONITRILE WHICH IS POLYMERIZED TO A MOLECULAR WEIGHT OF AT LEAST 50,000.
Claim 2
Dependent Claim
58 words
A WATER BASE DRILLING MUD COMPRISING A WATER BASE HAVING DISPERSED THEREIN A MINERAL CLAY, SALT IN AN AMOUNT AT LEAST 20 PERCENT BY WEIGHT OF THE SOLUTION, 1 TO 10 LBS. PER BBL. OF STARCH, AND 1 TO 5 LBS. PER BBL. OF A HYDROLYZED POLYACRYLONITRILE WHICH IS POLYMERIZED TO A MOLECULAR WEIGHT OF AT LEAST 50,000.
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) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |