US2857328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud
Assignee: Union Oil Company of California
•
Filing: 1953-01-19
•
Granted: 1958-10-21
•
Expires: 1973-01-19
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
- 👤 Raymond A Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:08
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1305; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203; C09K8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A DRILLING FLUID COMPRISING WATER, A FINELY DIVIDED SOLID SUSPENDED THEREIN, BETWEEN ABOUT 0.01% AND ABOUT 10% BY WEIGHT OF A SALT OF AN OIL SOLUBLE MINERAL OIL SULFONIC ACID, AND BETWEEN ABOUT 0.01% AND ABOUT 10% BY WEIGHT OF QUEBRACHO.
Claim 2
Dependent Claim
41 words
A DRILLING FLUID COMPRISING WATER, A FINELY DIVIDED SOLID SUSPENDED THEREIN, BETWEEN ABOUT 0.01% AND ABOUT 10% BY WEIGHT OF A SALT OF AN OIL SOLUBLE MINERAL OIL SULFONIC ACID, AND BETWEEN ABOUT 0.01% AND ABOUT 10% BY WEIGHT OF QUEBRACHO.
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) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |