US2618595A
Expired / Lapsed
US
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Well drilling composition
Assignee: Hercules Powder Co
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Filing: 1949-04-05
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Granted: 1952-11-18
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Expires: 1969-04-05
Abstract
No abstract record available.
Inventors
- 👤 Walter E Gloor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
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
82 words
AN AQUEOUS WELL DRILLING MUD CONTAINING A SMALL QUANITY OF A SUBSTANTIALLY WATER-SOLUBLE CARBOXYMETHYL HYDROXYETHYL CELLULOSE HAVING BETWEEN ABOUT 0.35 AND ABOUT 0.88 CARBOXYMETHYL GROUP AND BETWEEN ABOUT 0.15 AND ABOUT 0.75 HYDROXYETHYL GROUP PER ANHYDROGLUCOSE UNIT IN THE CELLULOSE IN AN AMOUNT SUFFICIENT TO IMPROVE THE VISCOSITY, RESISTANCE TO WATER LOSS, AND GEL CHARACTERISTICS OF SAID MUD, AND TO MAINTAIN THE AFORESAID IMPROVED PROPERTIES IN THE PRESENCE OF ALKALI AND ALKALINE EARTH METAL SALTS ACQUIRED BY SAID MUD DURING DRILLING OPERATIONS.
Claim 2
Dependent Claim
82 words
AN AQUEOUS WELL DRILLING MUD CONTAINING A SMALL QUANITY OF A SUBSTANTIALLY WATER-SOLUBLE CARBOXYMETHYL HYDROXYETHYL CELLULOSE HAVING BETWEEN ABOUT 0.35 AND ABOUT 0.88 CARBOXYMETHYL GROUP AND BETWEEN ABOUT 0.15 AND ABOUT 0.75 HYDROXYETHYL GROUP PER ANHYDROGLUCOSE UNIT IN THE CELLULOSE IN AN AMOUNT SUFFICIENT TO IMPROVE THE VISCOSITY, RESISTANCE TO WATER LOSS, AND GEL CHARACTERISTICS OF SAID MUD, AND TO MAINTAIN THE AFORESAID IMPROVED PROPERTIES IN THE PRESENCE OF ALKALI AND ALKALINE EARTH METAL SALTS ACQUIRED BY SAID MUD DURING DRILLING OPERATIONS.
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) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |