US2995189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cements having an extended thickening time, methods of making the same, and processes employing the same
Assignee: Phillips Petroleum Co
•
Filing: 1959-03-13
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Granted: 1961-08-08
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Expires: 1979-03-13
Abstract
No abstract record available.
Inventors
- 👤 Howard G Cutforth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:47
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/161; C04B24/168; C04B28/00; C04B28/02; C04B28/04; C09; C09K; C09K8/00; C09K8/42; C09K8/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A HYDRAULIC CEMENT CAPABLE OF FORMING A FLUID SLURRY WHEN MIXED WITH WATER, SAID HYDRAULIC CEMENT HAVING AN EXTENDED THICKENING TIME, SAID HYDRAULIC CEMENT COMPRISING A HYDRAULIC CEMENT MIXED WITH A MINOR PROPORTION BY WEIGHT OF THE DRY CEMENT OF A HYDRAULIC CEMENT THICKENING TIME EXTENDING AGENT CONSISTING OF FROM 25 PERCENT TO 75 PERCENT BY WEIGHT OF CELLULOSE SULFATE SELECTED FROM THE GROUP CONSISTING OF ACID CELLULOSE SULFATE AND ITS SALTS, THE REMAINDER BEING SELECTED FROM THE GROUP CONSISTING OF ACID CARBOXYMETHYL HYDROXYETHYL CELLULOSE MIXED ETHER AND ITS SALTS.
Claim 2
Dependent Claim
90 words
A HYDRAULIC CEMENT CAPABLE OF FORMING A FLUID SLURRY WHEN MIXED WITH WATER, SAID HYDRAULIC CEMENT HAVING AN EXTENDED THICKENING TIME, SAID HYDRAULIC CEMENT COMPRISING A HYDRAULIC CEMENT MIXED WITH A MINOR PROPORTION BY WEIGHT OF THE DRY CEMENT OF A HYDRAULIC CEMENT THICKENING TIME EXTENDING AGENT CONSISTING OF FROM 25 PERCENT TO 75 PERCENT BY WEIGHT OF CELLULOSE SULFATE SELECTED FROM THE GROUP CONSISTING OF ACID CELLULOSE SULFATE AND ITS SALTS, THE REMAINDER BEING SELECTED FROM THE GROUP CONSISTING OF ACID CARBOXYMETHYL HYDROXYETHYL CELLULOSE MIXED ETHER AND ITS SALTS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |