US2721841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive drilling fluids
Assignee: Union Oil Company of California
•
Filing: 1952-06-16
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Granted: 1955-10-25
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Expires: 1972-06-16
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:38
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A CONDUCTIVITY ADDITIVE COMPOSITION FOR OIL-BASE DRILLING FLUIDS, COMPRISING 100 PARTS BY WEIGHT OF WATER, BETWEEN ABOUT 10 AND ABOUT 40 PARTS BY WEIGHT OF A MIXTURE OF AN ALKALI-METAL HYDROXIDE AND WATER-SOLUBLE SALT OF A STRONG BASE AND A WEAK ACID, AND BETWEEN ABOUT 20 AND ABOUT 80 PARTS BY WEIGHT OF AN ALKALI-METAL SOAP OF HUMIC ACID.
Claim 2
Dependent Claim
59 words
A CONDUCTIVITY ADDITIVE COMPOSITION FOR OIL-BASE DRILLING FLUIDS, COMPRISING 100 PARTS BY WEIGHT OF WATER, BETWEEN ABOUT 10 AND ABOUT 40 PARTS BY WEIGHT OF A MIXTURE OF AN ALKALI-METAL HYDROXIDE AND WATER-SOLUBLE SALT OF A STRONG BASE AND A WEAK ACID, AND BETWEEN ABOUT 20 AND ABOUT 80 PARTS BY WEIGHT OF AN ALKALI-METAL SOAP OF HUMIC ACID.
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) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |