US2550236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud
Assignee: Union Oil Company of California
•
Filing: 1946-06-10
•
Granted: 1951-04-24
•
Expires: 1966-06-10
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
- 👤 Raymond A Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:00
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
AN AQUEOUS DRILLING FLUID HAVING IMPROVED WATER LOSS CHARACTERISTICS COMPRISING WATER, A CLAY AND A TREATING AGENT SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METAL AND AMMONIUM SALTS OF OIL SOLUBLE PETROLEUM SULFONIC ACIDS IN A MINOR PROPORTION BETWEEN ABOUT 0.5% AND 10% SUFFICIENT TO REDUCE THE WATER LOSS TO A VALUE NOT GREATER THAN ABOUT 45 ML. IN THE FIRST HOUR OF FILTRATION.
Claim 2
Dependent Claim
65 words
AN AQUEOUS DRILLING FLUID HAVING IMPROVED WATER LOSS CHARACTERISTICS COMPRISING WATER, A CLAY AND A TREATING AGENT SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METAL AND AMMONIUM SALTS OF OIL SOLUBLE PETROLEUM SULFONIC ACIDS IN A MINOR PROPORTION BETWEEN ABOUT 0.5% AND 10% SUFFICIENT TO REDUCE THE WATER LOSS TO A VALUE NOT GREATER THAN ABOUT 45 ML. IN THE FIRST HOUR OF FILTRATION.
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US2369407A
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US2209591A
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US2342275A
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US2286835A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |