US2637692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-base drilling fluids
Assignee: Union Oil Company of California
•
Filing: 1950-10-27
•
Granted: 1953-05-05
•
Expires: 1970-10-27
Abstract
No abstract record available.
Inventors
- 👤 Paul G Nahin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:22
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/91
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A DRILLING FLUID COMPOSITION ESSENTIALLY COMPRISING A MAJOR PROPORTION OF A MINERAL OIL AND A MINOR PROPORTION, SUFFICIENT TO IMPART GEL STRENGTH AND WALL-BUILDING PROPERTIES TO SAID OIL OF A MODIFIED CLAY PREPARED BY HEATING A HYDRATABLE CLAY AT A TEMPERATURE BETWEEN ABOUT 250* AND ABOUT 500* C. FOR FROM ABOUT 0.5 TO ABOUT 10 HOURS, COOLING THE CLAY AND FORMING A SLURRY OF THE COOLED CLAY AND AN AGENT SELECTED FROM THE CLASS CONSISTING OF GLYCOLS AND ALKYL ETHERS OF GLYCOLS CONTAINING FROM 2 TO 10 CARBON ATOMS, ALLOWING SAID SLURRY TO STAND UNTIL SAID AGENT IS ADSORBED INTO THE INTER-LAMINA SPACES OF THE CLAY, AND THEREAFTER DRYING THE CLAY CONTAINING THE ADSORBED AGENT.
References Cited (Backward Citations)
US2055666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |