US2953525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil base drilling fluid
Assignee: Shell USA Inc
•
Filing: 1956-02-29
•
Granted: 1960-09-20
•
Expires: 1976-02-29
Abstract
No abstract record available.
Inventors
- 👤 Young Charles William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:12
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
AN OIL-BASED MUD COMPRISING A PREDOMINANT QUANTITY OF AN ASPHALTIC MINERAL OIL CONTAINING ASPHALTENES AND MALTENES HAVING A COMBINED WEIGHT OF AT LEAST 5%, THE REACTION PRODUCTS FORMED BY THE ADDITION OF FROM 0.1 TO ABOUT 5% BY WEIGHT OF SULFURIC ACID TO SAID OIL, AND THE REACTION PRODUCTS FORMED BY THE ADDITION OF LIME SUFFICIENT IN QUANTITY TO NEUTRALIZE SAID ACID-TREATED OIL, SAID REACTION PRODUCTS BEING CAPABLE OF FORMING A SUBSTANTIALLY FLUID-IMPERVIOUS FILTER CAKE ON THE WALL OF THE WELL.
Claim 2
Dependent Claim
81 words
AN OIL-BASED MUD COMPRISING A PREDOMINANT QUANTITY OF AN ASPHALTIC MINERAL OIL CONTAINING ASPHALTENES AND MALTENES HAVING A COMBINED WEIGHT OF AT LEAST 5%, THE REACTION PRODUCTS FORMED BY THE ADDITION OF FROM 0.1 TO ABOUT 5% BY WEIGHT OF SULFURIC ACID TO SAID OIL, AND THE REACTION PRODUCTS FORMED BY THE ADDITION OF LIME SUFFICIENT IN QUANTITY TO NEUTRALIZE SAID ACID-TREATED OIL, SAID REACTION PRODUCTS BEING CAPABLE OF FORMING A SUBSTANTIALLY FLUID-IMPERVIOUS FILTER CAKE ON THE WALL OF THE WELL.
References Cited (Backward Citations)
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US2216955A
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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) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |