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US2852402A
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Cement composition
Assignee: Phillips Petroleum Co
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Filing: 1955-01-03
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Granted: 1958-09-16
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Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Francis J Shell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:02
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C04B28/00; C04B28/02; E21B33/10; E21B33/13; E21B33/14; E21B33/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A CEMENT COMPOSITION AQUEOUS SLURRY COMPRISING A MAJOR PORTION OF A DRY HYDRAULIC CEMENT MIXED WITH MINOR WEIGHT PERCENTAGES OF THE WEIGHT OF SAID DRY HYDRAULIC CEMENT OF 0.1 TO 10% OF A WATER LOSS REDUCING AGENT CONSISTING OF ACID CARBOXYALKYL HYDROXYETHYL CELLULOSE MIXED ETHERS IN WHICH THE ALKYL GROUP CONTAINS 1 TO 2 CARBON ATOMS, THE TOTAL SUBSTITUTION PER ANHYDROGLUCOSE UNIT OF THE CELLULOSE OF CARBOXYALKYL AND HYDROXYETHYL GROUPS IS BETWEEN 0.5 TO 1.75, THE HYDROXYETHYL SUBSTITUTION IS FROM 0.35 TO 1.35, AND THE CARBOXYALKYL SUBSTITUTION IS FROM 0.15 TO 1.2, AND SALTS OF SAID MIXED ETHERS, SUFFICIENT WATER TO MAKE SAID SLURRY FLUID, AND FROM 500 TO 20,000 PARTS PER MILLION BY WEIGHT SODIUM CHLORIDE IN SAID WATER AS A SECOND WATER LOSS REDUCING AGENT.
Claim 2
Dependent Claim
127 words
A CEMENT COMPOSITION AQUEOUS SLURRY COMPRISING A MAJOR PORTION OF A DRY HYDRAULIC CEMENT MIXED WITH MINOR WEIGHT PERCENTAGES OF THE WEIGHT OF SAID DRY HYDRAULIC CEMENT OF 0.1 TO 10% OF A WATER LOSS REDUCING AGENT CONSISTING OF ACID CARBOXYALKYL HYDROXYETHYL CELLULOSE MIXED ETHERS IN WHICH THE ALKYL GROUP CONTAINS 1 TO 2 CARBON ATOMS, THE TOTAL SUBSTITUTION PER ANHYDROGLUCOSE UNIT OF THE CELLULOSE OF CARBOXYALKYL AND HYDROXYETHYL GROUPS IS BETWEEN 0.5 TO 1.75, THE HYDROXYETHYL SUBSTITUTION IS FROM 0.35 TO 1.35, AND THE CARBOXYALKYL SUBSTITUTION IS FROM 0.15 TO 1.2, AND SALTS OF SAID MIXED ETHERS, SUFFICIENT WATER TO MAKE SAID SLURRY FLUID, AND FROM 500 TO 20,000 PARTS PER MILLION BY WEIGHT SODIUM CHLORIDE IN SAID WATER AS A SECOND WATER LOSS REDUCING AGENT.
References Cited (Backward Citations)
USRE23873E
Cited
US2121087A
Cited
US2313107A
Cited
US2580565A
Cited
US2614634A
Cited
US2598675A
Cited
US2629667A
Cited
US2673810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |