US2795508A
Expired / Lapsed
US
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Sulfoalkyl cellulose ethers and their salts as hydraulic natural cement set retarders
Assignee: Phillips Petroleum Co
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Filing: 1952-08-22
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Granted: 1957-06-11
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Expires: 1972-08-22
Abstract
No abstract record available.
Inventors
- 👤 Herman H Kaveler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:13
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C04; C04B; C04B24/00; C04B24/16; C04B24/161; C04B24/168; C04B2103/00; C04B2103/20; C04B2103/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A CEMENT CAPABLE OF FORMING A FLUID SLURRY WHEN MIXED WITH WATER AND HAVING THEREAFTER AN EXTENDED THICKENING TIME, CONSISTING ESSENTIALLY OF A DRY HYDRAULIC NATURAL CEMENT MIXED WITH 0.3 TO 5 PERCENT BY WEIGHT OF SAID DRY CEMENT OF A WATER SOLUBLE CEMENT THICKENING TIME EXTENDING AGENT SELECTED FROM THE GROUP CONSISTING OF ACID A-METHYLSULFOMETHYL CELLULOSE ETHER, ACID SULFOETHYL CELLULOSE ETHER, ACID SULFORPROPYL CELLULOSE ETHER, ACID 2-METHYL-2-SULFOETHY CELLULOSE, ETHER, AND ACID A, A-DIMETHYLSULFOMETHYL CELLULOSE ETHER, AND WATER SOLUBLE SALTS OF THE SAME.
Claim 2
Dependent Claim
83 words
A CEMENT CAPABLE OF FORMING A FLUID SLURRY WHEN MIXED WITH WATER AND HAVING THEREAFTER AN EXTENDED THICKENING TIME, CONSISTING ESSENTIALLY OF A DRY HYDRAULIC NATURAL CEMENT MIXED WITH 0.3 TO 5 PERCENT BY WEIGHT OF SAID DRY CEMENT OF A WATER SOLUBLE CEMENT THICKENING TIME EXTENDING AGENT SELECTED FROM THE GROUP CONSISTING OF ACID A-METHYLSULFOMETHYL CELLULOSE ETHER, ACID SULFOETHYL CELLULOSE ETHER, ACID SULFORPROPYL CELLULOSE ETHER, ACID 2-METHYL-2-SULFOETHY CELLULOSE, ETHER, AND ACID A, A-DIMETHYLSULFOMETHYL CELLULOSE ETHER, AND WATER SOLUBLE SALTS OF THE SAME.
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) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |