US2776259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling muds
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1955-09-28
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Granted: 1957-01-01
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Expires: 1975-09-28
Abstract
No abstract record available.
Inventors
- 👤 Richard A Salathiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:35
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
119 words
A DRILLING MUD COMPRISING AT LEAST 5% BY WEIGHT OF FINELY DIVIDED SOLIDS IN AN AQUEOUS SALINE MEDIUM TO WHICH HAS BEEN ADDED FROM ABOUT 1 TO ABOUT 5 POUNDS PER 42 GALLON BARREL OF MUD OF AN ALKALI METAL CARBOXYALKYLCELLULOSE AND FROM ABOUT 0.1 TO ABOUT 5 POUNDS PER 42 GALLON BARREL OF MUD OF AN ADDITIVE TAKEN FROM THE GROUP CONSISTING OF WATER SOLUBLE ALKALI METAL SULFIDES, POLYSULFIDES AND HYDROSULITES, AND ALKALI METAL CARBOXYALKYLCELLULOSE AND SAID ADDITIVE HAVING BEEN ADDED IN AMOUNTS SUFFICIENT TO MATERIALLY REDUCE THE TENDENCY OF THE DRILLING MUD TO LOSE WATER BY FILTRATION, SAID ALKALI METAL CARBOXYALKYLCELLULOSE CONTAINING FROM ABOUT 0.7 TO ABOUT 0.9 ALKALI METAL CARBOXYALKYL SUBSTITUENT GROUPS PER GLUOSE ANHYDRIDE UNIT.
Claim 2
Dependent Claim
119 words
A DRILLING MUD COMPRISING AT LEAST 5% BY WEIGHT OF FINELY DIVIDED SOLIDS IN AN AQUEOUS SALINE MEDIUM TO WHICH HAS BEEN ADDED FROM ABOUT 1 TO ABOUT 5 POUNDS PER 42 GALLON BARREL OF MUD OF AN ALKALI METAL CARBOXYALKYLCELLULOSE AND FROM ABOUT 0.1 TO ABOUT 5 POUNDS PER 42 GALLON BARREL OF MUD OF AN ADDITIVE TAKEN FROM THE GROUP CONSISTING OF WATER SOLUBLE ALKALI METAL SULFIDES, POLYSULFIDES AND HYDROSULITES, AND ALKALI METAL CARBOXYALKYLCELLULOSE AND SAID ADDITIVE HAVING BEEN ADDED IN AMOUNTS SUFFICIENT TO MATERIALLY REDUCE THE TENDENCY OF THE DRILLING MUD TO LOSE WATER BY FILTRATION, SAID ALKALI METAL CARBOXYALKYLCELLULOSE CONTAINING FROM ABOUT 0.7 TO ABOUT 0.9 ALKALI METAL CARBOXYALKYL SUBSTITUENT GROUPS PER GLUOSE ANHYDRIDE UNIT.
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) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |