Patent JPH0457860A successfully refreshed from Google Patents.
US2510153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluids stable in the presence of brines rich in polyvalent cations
Assignee: Dow Chemical Co
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Filing: 1949-02-26
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Granted: 1950-06-06
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Expires: 1969-02-26
Abstract
No abstract record available.
Inventors
- 👤 Richard W Swinehart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
AN AQUEOUS MUD FOR USE IN DRILLING WELLS, HAVING DISSOLVED THEREIN, FOR EACH BARREL OF MUD, FROM 1 TO 5 POUNDS OF A SALT OF CARBOYMETHYL METHY CELLULOSE WHICH IS SOLUBLE IN AQUEOUS MEDIA, HAVING BOTH FROM 10 TO 18 PER CENT METHOXYL CONTENT AND FROM 0.1 TO 0.5 CARBOCYMETHYL SUBSTITUENT IN THE AVERAGE C6 UNIT OF THE CELLULOSE MOLECULE, SAID MUD BEING CHARACTERIZED BY ITS ABILITY TO FORM A THIN FILTER CAKE HAVING LOW WATER-LOSS VALUES, AND BY ITS TOLERANCE FOR BRINES CONTAINING POLYVALENT CATIONS WITHOUT LOSS OF ITS CAKE-FORMING AND WATER-RETENTION PROPERTIES.
Claim 2
Dependent Claim
94 words
AN AQUEOUS MUD FOR USE IN DRILLING WELLS, HAVING DISSOLVED THEREIN, FOR EACH BARREL OF MUD, FROM 1 TO 5 POUNDS OF A SALT OF CARBOYMETHYL METHY CELLULOSE WHICH IS SOLUBLE IN AQUEOUS MEDIA, HAVING BOTH FROM 10 TO 18 PER CENT METHOXYL CONTENT AND FROM 0.1 TO 0.5 CARBOCYMETHYL SUBSTITUENT IN THE AVERAGE C6 UNIT OF THE CELLULOSE MOLECULE, SAID MUD BEING CHARACTERIZED BY ITS ABILITY TO FORM A THIN FILTER CAKE HAVING LOW WATER-LOSS VALUES, AND BY ITS TOLERANCE FOR BRINES CONTAINING POLYVALENT CATIONS WITHOUT LOSS OF ITS CAKE-FORMING AND WATER-RETENTION PROPERTIES.
References Cited (Backward Citations)
US2425768A
Cited
US2481545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-05 | 1953-12-05 | 1954-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-05 | 1957-12-05 | 1958-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-05 | 1961-12-05 | 1962-06-06 | $7700.00 | Window Closed / Lapsed |