US2531812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Application of drilling fluids
Assignee: Individual
•
Filing: 1948-01-16
•
Granted: 1950-11-28
•
Expires: 1968-01-16
Abstract
No abstract record available.
Inventors
- 👤 Ernst A Hauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:42
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/44; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/901; Y10S507/91; Y10S71/00; Y10S71/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
AN OIL-BASE WELL-DRILLING FLUID CONTAINING A MODIFIED CLAY, ORIGINALLY EXHIBITING A SUBSTANIAL BASE-EXCHANGE CAPACITY, IN WHICH THE CLAY CATION HAS BEEN REPLACED BY A SUBSTITUTED CATION OF THE CLASS OF ONIUM BASES CONSISTING OF AMMONIUM, PHOSOPHONIUM, SULFONIUM, ARSONIUM, STIBONIUM, OXONIUM AND TELLURONIUM BASES, AND WHICH FORMS A GEL IN THE OIL PHASE OF THE FLUID AND HAS A SUBSTANTIAL GEL CHARACTERISTIC THEREIN TO THE EXTENT THAT 2 GRAMS OF WHICH MODIFIED CLAY SWELL TO AT LEAST 12 MILLILITERS IN NITROBENZENE.
Claim 2
Dependent Claim
80 words
AN OIL-BASE WELL-DRILLING FLUID CONTAINING A MODIFIED CLAY, ORIGINALLY EXHIBITING A SUBSTANIAL BASE-EXCHANGE CAPACITY, IN WHICH THE CLAY CATION HAS BEEN REPLACED BY A SUBSTITUTED CATION OF THE CLASS OF ONIUM BASES CONSISTING OF AMMONIUM, PHOSOPHONIUM, SULFONIUM, ARSONIUM, STIBONIUM, OXONIUM AND TELLURONIUM BASES, AND WHICH FORMS A GEL IN THE OIL PHASE OF THE FLUID AND HAS A SUBSTANTIAL GEL CHARACTERISTIC THEREIN TO THE EXTENT THAT 2 GRAMS OF WHICH MODIFIED CLAY SWELL TO AT LEAST 12 MILLILITERS IN NITROBENZENE.
References Cited (Backward Citations)
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US2033856A
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US2055666A
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US2217926A
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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) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |