US2836556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud
Assignee: Sunoco Inc
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Filing: 1957-01-18
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Granted: 1958-05-27
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Expires: 1977-01-18
Abstract
No abstract record available.
Inventors
- 👤 William E Thompson
- 👤 Chester N White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:22
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/145
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
AN AQUEOUS DRILLING MUD COMPRISING A HYDRATABLE ALKALINE EARTH METAL CLAY, EXCESS ALKALINE EARTH METAL HYDROXIDE AND AN ORGANICALLY DERIVED CLAY DISPERSANT, SAID DRILLING MUD HAVING ADDED THERETO FINELY DIVIDED SILICA MAINLY FINER THAN 300 MESH IN AMOUNT OF AT LEAST 5% BASED ON THE CLAY SOLIDS CONTENT AND SUFFICIENT TO INHIBIT THICKENING OF THE COMPOSITION WHEN SUBJECTED TO HIGH TEMPERATURE CONDITIONS.
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) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |