Patent US2856355A successfully refreshed from Google Patents.
US2856355A
Expired / Lapsed
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Drilling fluid
Assignee: Texaco Inc
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Filing: 1956-07-25
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Granted: 1958-10-14
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Expires: 1976-07-25
Abstract
No abstract record available.
Inventors
- 👤 Walter J Weiss
- 👤 Wilbur L Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
AN AQUEOUS DRILLING FLUID COMPRISING AN ALKALINE AQUEOUS PHASE WHICH CONSISTS ESSENTIALLY OF A SATURATED AQUEOUS CALCIUM HYDROXIDE SOLUTION AND A WATER-SOLUBLE BARIUM COMPOUND SUCH THAT THE BARIUM ION CONCENTRATION IN SAID AQUEOUS PHASE IS AT LEAST 300 PARTS PER MILLION BY WEIGHT, SAID AQUEOUS PHASE HAVING PH IN THE RANGE 11.2-13.0.
Claim 2
Dependent Claim
52 words
AN AQUEOUS DRILLING FLUID COMPRISING AN ALKALINE AQUEOUS PHASE WHICH CONSISTS ESSENTIALLY OF A SATURATED AQUEOUS CALCIUM HYDROXIDE SOLUTION AND A WATER-SOLUBLE BARIUM COMPOUND SUCH THAT THE BARIUM ION CONCENTRATION IN SAID AQUEOUS PHASE IS AT LEAST 300 PARTS PER MILLION BY WEIGHT, SAID AQUEOUS PHASE HAVING PH IN THE RANGE 11.2-13.0.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |