Patent US2960465A successfully refreshed from Google Patents.
US2960465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low water loss aqueous drilling fluid
Assignee: Texaco Inc
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Filing: 1957-07-30
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Granted: 1960-11-15
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Expires: 1977-07-30
Abstract
No abstract record available.
Inventors
- 👤 Brink Karl C Ten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:40
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/145; Y; Y10; Y10S; Y10S507/00; Y10S507/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A WATER BASE DRILLING FLUID CHARACTERIZED BY A RELATIVELY LOW WATER LOSS CONTAINING A DRILLING CLAY DISPERSED IN WATER TOGETHER WITH AN AMOUNT OF A HYDROCARBON OILWETTED BETONITIC CLAY IN THE RANGE OF 0.2-25% BY WT. BASED ON SAID DRILLING FLUID.
Claim 2
Dependent Claim
41 words
A WATER BASE DRILLING FLUID CHARACTERIZED BY A RELATIVELY LOW WATER LOSS CONTAINING A DRILLING CLAY DISPERSED IN WATER TOGETHER WITH AN AMOUNT OF A HYDROCARBON OILWETTED BETONITIC CLAY IN THE RANGE OF 0.2-25% BY WT. BASED ON SAID DRILLING FLUID.
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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) | 1963-11-15 | 1964-05-16 | 1964-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-15 | 1968-05-16 | 1968-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-15 | 1972-05-16 | 1972-11-15 | $7700.00 | Window Closed / Lapsed |