Patent US3111491A successfully refreshed from Google Patents.
US3111491A
Expired / Lapsed
US
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Electrically conductive oil-base drilling fluids
Assignee: Union Oil Company of California
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Filing: 1960-05-31
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Granted: 1963-11-19
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Expires: 1980-05-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Earle R Atkins
- 👤 Paul W Fischer
- 👤 Paul G Nahin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:09
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/907; Y10S507/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN OIL BASE DRILLING FLUID CONSISTING ESSENTIALLY OF THE FOLLOWING: A MINERAL OIL, SUSPENDED SOLIDS, SUFFICIENT OF A FIRST DISPERSING AGENT TO MAINTAIN SAID SOLIDS DISPERSED IN SAID OIL, BETWEEN ABOUT 3 AND ABOUT 10 PERCENT BY WEIGHT OF WATER, BETWEEN ABOUT 0.01 AND ABOUT 5 PERCENT BY WEIGHT OF ELECTROLYTE SELECTED FROM THE CLASS CONSISTING OF WATER-SOLUBLE METAL SALTS AND ALKALI-METAL HYDROXIDES, BETWEEN ABOUT 0.1 AND ABOUT 8 PERCENT BY WEIGHT OF A SECOND DISPERSING AGENT TO MAINTAIN SAID ELECTROLYTE DISPERSED IN SAID DRILLING FLUID AND SUFFICIENT RADIOACTIVE MATERIAL TO PROVIDE BETWEEN ABOUT 1 AND 1000 MICROCURIES PER GALLON.
Claim 2
Dependent Claim
100 words
AN OIL BASE DRILLING FLUID CONSISTING ESSENTIALLY OF THE FOLLOWING: A MINERAL OIL, SUSPENDED SOLIDS, SUFFICIENT OF A FIRST DISPERSING AGENT TO MAINTAIN SAID SOLIDS DISPERSED IN SAID OIL, BETWEEN ABOUT 3 AND ABOUT 10 PERCENT BY WEIGHT OF WATER, BETWEEN ABOUT 0.01 AND ABOUT 5 PERCENT BY WEIGHT OF ELECTROLYTE SELECTED FROM THE CLASS CONSISTING OF WATER-SOLUBLE METAL SALTS AND ALKALI-METAL HYDROXIDES, BETWEEN ABOUT 0.1 AND ABOUT 8 PERCENT BY WEIGHT OF A SECOND DISPERSING AGENT TO MAINTAIN SAID ELECTROLYTE DISPERSED IN SAID DRILLING FLUID AND SUFFICIENT RADIOACTIVE MATERIAL TO PROVIDE BETWEEN ABOUT 1 AND 1000 MICROCURIES PER GALLON.
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) | 1966-11-18 | 1967-05-20 | 1967-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-18 | 1971-05-20 | 1971-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-18 | 1975-05-20 | 1975-11-19 | $7700.00 | Window Closed / Lapsed |