Patent US3039958A successfully refreshed from Google Patents.
US3039958A
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Well drilling fluids containing lignite derivatives
Assignee: Magnet Cove Barium Corp
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Filing: 1957-10-28
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Granted: 1962-06-19
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Expires: 1977-10-28
Abstract
No abstract record available.
Inventors
- 👤 Kenneth P Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:35
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A FLUID USEFUL IN THE DRILLING COMPLETING AND WORKOVER OF WELLS WHICH COMPRISES AN AQUEOUS DISPERSION OF CLAYEY SOLIDS AND AN AMOUNT OF A WATER-SOLUBLE LIGNITE SULFONATE MATERIAL SUFFICIENT TO REDUCE THE YIELD VALLUE OF SAID DISPERSION, SAID LIGNITE SULFONATE MATERIAL RESULTING FROM REACTING LIGNITE, ALKALI METAL BASE AND SULFUR IN AQUEOUS SUSPENSION AT A TEMPERATURE IN THE RANGE FROM 246 TO 375 DEGREES F., OXIDIZING THE RESULTING THIO-LIGNITE REACTION PRODUCT AT A TEMPERATURE IN THE RANGE FROM 40 TO 375 DEGREES F. FOR A TIME NECESSARY TO CONVERT SAID REACTION PRODUCT TO WATER-SOLUBLE LIGNITE SULFONATES.
Claim 2
Dependent Claim
96 words
A FLUID USEFUL IN THE DRILLING COMPLETING AND WORKOVER OF WELLS WHICH COMPRISES AN AQUEOUS DISPERSION OF CLAYEY SOLIDS AND AN AMOUNT OF A WATER-SOLUBLE LIGNITE SULFONATE MATERIAL SUFFICIENT TO REDUCE THE YIELD VALLUE OF SAID DISPERSION, SAID LIGNITE SULFONATE MATERIAL RESULTING FROM REACTING LIGNITE, ALKALI METAL BASE AND SULFUR IN AQUEOUS SUSPENSION AT A TEMPERATURE IN THE RANGE FROM 246 TO 375 DEGREES F., OXIDIZING THE RESULTING THIO-LIGNITE REACTION PRODUCT AT A TEMPERATURE IN THE RANGE FROM 40 TO 375 DEGREES F. FOR A TIME NECESSARY TO CONVERT SAID REACTION PRODUCT TO WATER-SOLUBLE LIGNITE SULFONATES.
References Cited (Backward Citations)
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US2331281A
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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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |