Patent US2655475A successfully refreshed from Google Patents.
US2655475A
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Drilling mud
Assignee: Union Oil Company of California
•
Filing: 1949-09-26
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Granted: 1953-10-13
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Expires: 1969-09-26
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
- 👤 Raymond A Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:35
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A DRILLING FLUID COMPRISING WATER, A FINELY DIVIDED SOLID SUSPENDED THEREIN, A SOAP OF THE GROUP CONSISTING OF THE ALKALI METAL, AMMONIUM AND AMINE SALTS OF OIL-SOLUBLE MINERAL OIL SULFONIC ACIDS, AND A WATER DISPERSIBLE NATURAL GUM.
Claim 2
Dependent Claim
37 words
A DRILLING FLUID COMPRISING WATER, A FINELY DIVIDED SOLID SUSPENDED THEREIN, A SOAP OF THE GROUP CONSISTING OF THE ALKALI METAL, AMMONIUM AND AMINE SALTS OF OIL-SOLUBLE MINERAL OIL SULFONIC ACIDS, AND A WATER DISPERSIBLE NATURAL GUM.
References Cited (Backward Citations)
US2209591A
Cited
US2216955A
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US2211688A
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US2364434A
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US2319705A
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US2331049A
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US2407398A
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US2550236A
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US2488304A
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US2568992A
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US2498301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |