US2871189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid
Assignee: Texaco Inc
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Filing: 1957-02-27
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Granted: 1959-01-27
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Expires: 1977-02-27
Abstract
No abstract record available.
Inventors
- 👤 John S Brukner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:34
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A AQUEOUS DRILLING FLUID COMPRISING AN ALKALINE AQUEOUS PHASE SATURATED WITH CALCIUM HYDROXIDE, A WATER SOLUBLE CALCIUM SALT WHICH HAS A SOLUBILIATY IN SAID AQUEOUS PHASE GREATER THAN THAT OF CALCIUM HYDROXIDE DISSOLVED THEREIN TO YIELD A CALCIUM ION CONCENTRATION IN SAID AQUEOUS PHASE OF AT LEAST 200 PARTS PER MILLION BY WEIGHT, SAID AQUEOUS PHASE HAVING A PH NOT GREATER THAN 12.6 AND A MINOR AMOUNT IN THE RANGE 0.01-10% BY WEIGHT BASED ON SAID FLUID OF A WATER SOLUBLE ORGANIC OXYGEN-CONTAINING SILICON COMPOUND IN SAID FLUID.
Claim 2
Dependent Claim
88 words
A AQUEOUS DRILLING FLUID COMPRISING AN ALKALINE AQUEOUS PHASE SATURATED WITH CALCIUM HYDROXIDE, A WATER SOLUBLE CALCIUM SALT WHICH HAS A SOLUBILIATY IN SAID AQUEOUS PHASE GREATER THAN THAT OF CALCIUM HYDROXIDE DISSOLVED THEREIN TO YIELD A CALCIUM ION CONCENTRATION IN SAID AQUEOUS PHASE OF AT LEAST 200 PARTS PER MILLION BY WEIGHT, SAID AQUEOUS PHASE HAVING A PH NOT GREATER THAN 12.6 AND A MINOR AMOUNT IN THE RANGE 0.01-10% BY WEIGHT BASED ON SAID FLUID OF A WATER SOLUBLE ORGANIC OXYGEN-CONTAINING SILICON COMPOUND IN SAID FLUID.
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |