Patent US2823135A successfully refreshed from Google Patents.
US2823135A
Expired / Lapsed
US
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Low water loss cement slurry comprising dextran
Assignee: Individual
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Filing: 1956-01-06
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Granted: 1958-02-11
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Expires: 1976-01-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry A Toulmin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:42
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C09; C09K; C09K8/00; C09K8/42; C09K8/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A CEMENT ADAPTED TO FORM A FLUID, PUMPABLE SLURRY ON THE ADDITION OF WATER THERETO CONSISTING ESSENTIALLY OF A MIXTURE OF HYDRAULIC CEMENT AND A SMALL AMOUNT, SUFFICIENT TO PREVENT LOSS OF WATER FROM THE SLURRY, OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF (1) WATERDISPERSIBLE DEXTRAN HAVING A MOLECULAR WEIGHT BETWEEN 5000 AND THAT OF NATIVE, UNHYDROLYZED, MICROBIOLOGICALLY PRODUCED DEXTRAN AND (2) MIXTURES OF NATIVE WATERDISPERSIBLE DEXTRAN AND FRUCTOSE PRODUCED BY THE ACTION OF DEXTRAN-SYNTHESIZING STRAINS OF LEUCONOSTOC ON SUCROSE.
Claim 2
Dependent Claim
82 words
A CEMENT ADAPTED TO FORM A FLUID, PUMPABLE SLURRY ON THE ADDITION OF WATER THERETO CONSISTING ESSENTIALLY OF A MIXTURE OF HYDRAULIC CEMENT AND A SMALL AMOUNT, SUFFICIENT TO PREVENT LOSS OF WATER FROM THE SLURRY, OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF (1) WATERDISPERSIBLE DEXTRAN HAVING A MOLECULAR WEIGHT BETWEEN 5000 AND THAT OF NATIVE, UNHYDROLYZED, MICROBIOLOGICALLY PRODUCED DEXTRAN AND (2) MIXTURES OF NATIVE WATERDISPERSIBLE DEXTRAN AND FRUCTOSE PRODUCED BY THE ACTION OF DEXTRAN-SYNTHESIZING STRAINS OF LEUCONOSTOC ON SUCROSE.
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) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |