Patent US2587501A successfully refreshed from Google Patents.
US2587501A
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Drilling fluid compositions
Assignee: Standard Oil Development Co
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Filing: 1949-12-30
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Granted: 1952-02-26
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Expires: 1969-12-30
Abstract
No abstract record available.
Inventors
- 👤 Victor G Meadors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:01
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A DRILLING FLUID COMPRISING AN AQUEOUS DISPERSION OF A CLAY TO WHICH HAS BEEN ADDED A VISCOSITY INCREASING AMOUNT OF A POLYOXYLALKYLENE DERIVATIVE OF A HEXITAN ESTER OF A HIGHER FATTY ACID.
Claim 2
Dependent Claim
32 words
A DRILLING FLUID COMPRISING AN AQUEOUS DISPERSION OF A CLAY TO WHICH HAS BEEN ADDED A VISCOSITY INCREASING AMOUNT OF A POLYOXYLALKYLENE DERIVATIVE OF A HEXITAN ESTER OF A HIGHER FATTY ACID.
References Cited (Backward Citations)
US2425768A
Cited
US2423144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |