US2789949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid
Assignee: Texaco Inc
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Filing: 1955-08-30
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Granted: 1957-04-23
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Expires: 1975-08-30
Abstract
No abstract record available.
Inventors
- 👤 Clarence B Scotty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:21
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A METHOD OF CONVERTING AN AQUEOUS ALKALI METAL BASE CLAY-CONTAINING DRILLING FLUID TO A DRILLING FLUID CHARACTERIZED BY AN ALKALINE EARTH METAL BASE WITHOUT EFFECTING UNDERSIRABLE FLOCCULATION OF SAID FLUID COMPRISING THE STEPS OF ESTABLISHING AND MAINTAINING SAID ALKALI METAL BASE DRILLING FLUID AT A PH IN THE ALKALINE RANGE AND ADDING AN ALKALINE EARTH METAL-CONTAINING COMPOUND IN EXCESS OF THE AMOUNT THEORETICALLY REQUIRED TO CONVERT SAID FLUID, SAID COMPOUND BEING CHARACTERIZED BY A NEGATIVE ION COMPATIBLE WITH SAID FLUID AND HAVING A SOLUBILITY IN SAID FLUID WHEN MEASURED AT 20* C. LESS THAN THAT OF LIME AND MORE THAN THAT OF CALCIUM OXALATE.
Claim 2
Independent Claim
104 words
A METHOD OF CONVERTING AN AQUEOUS ALKALI METAL BASE CLAY-CONTAINING DRILLING FLUID TO A DRILLING FLUID CHARACTERIZED BY AN ALKALINE EARTH METAL BASE WITHOUT EFFECTING UNDERSIRABLE FLOCCULATION OF SAID FLUID COMPRISING THE STEPS OF ESTABLISHING AND MAINTAINING SAID ALKALI METAL BASE DRILLING FLUID AT A PH IN THE ALKALINE RANGE AND ADDING AN ALKALINE EARTH METAL-CONTAINING COMPOUND IN EXCESS OF THE AMOUNT THEORETICALLY REQUIRED TO CONVERT SAID FLUID, SAID COMPOUND BEING CHARACTERIZED BY A NEGATIVE ION COMPATIBLE WITH SAID FLUID AND HAVING A SOLUBILITY IN SAID FLUID WHEN MEASURED AT 20* C. LESS THAN THAT OF LIME AND MORE THAN THAT OF CALCIUM OXALATE.
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) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |