US2902378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low water loss cement slurries comprising carboxymethyl dextran and salts thereof
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1956-11-14
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Granted: 1959-09-01
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Expires: 1976-11-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry A Toulmin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:49
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A FLUID, PUMPABLE, HYDRAULIC CEMENT SLURRY CONSISTING ESSENTIALLY OF A HYDRAULIC CEMENT, AN AMOUNT OF WATER SUFFICIENT TO RENDER THE SLURRY FLUID AND PUMPABLE AND, FOR MAINTAINING THE INITIAL FLUIDITY AND PUMPABILITY OF THE SLURRY PRIOR TO PLACEMENT WITHOUT DELAYING THE SETTING TIME FOR THE CEMENT AFTER PLACEMENT OF THE SLURRY, FROM ABOUT 0.01% TO ABOUT 0.1% OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CARBOXYMETHYL ETHERS OF NATIVE, WATER-SOLUBLE, UNHYDROLYZED DEXTRANS CONTAINIGN AN AVERAGE OF FROM 1.0 UP TO 3.0 CARBOXYMETHYL GROUPS PER ANHYDROGLUCOSE UNIT, AND ALKALI METAL SALTS OF SAID ETHERS.
Claim 2
Dependent Claim
94 words
A FLUID, PUMPABLE, HYDRAULIC CEMENT SLURRY CONSISTING ESSENTIALLY OF A HYDRAULIC CEMENT, AN AMOUNT OF WATER SUFFICIENT TO RENDER THE SLURRY FLUID AND PUMPABLE AND, FOR MAINTAINING THE INITIAL FLUIDITY AND PUMPABILITY OF THE SLURRY PRIOR TO PLACEMENT WITHOUT DELAYING THE SETTING TIME FOR THE CEMENT AFTER PLACEMENT OF THE SLURRY, FROM ABOUT 0.01% TO ABOUT 0.1% OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CARBOXYMETHYL ETHERS OF NATIVE, WATER-SOLUBLE, UNHYDROLYZED DEXTRANS CONTAINIGN AN AVERAGE OF FROM 1.0 UP TO 3.0 CARBOXYMETHYL GROUPS PER ANHYDROGLUCOSE UNIT, AND ALKALI METAL SALTS OF SAID ETHERS.
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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |