US2876841A
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
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Filing: 1952-12-29
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Granted: 1959-03-10
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Expires: 1972-12-29
Abstract
No abstract record available.
Inventors
- 👤 Martin A Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:26
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/34; C09; C09K; C09K8/00; C09K8/42; C09K8/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A HYDRAULIC CEMENT AQUEOUS SLURRY COMPRISING A MAJOR AMOUNT OF A HYDRAULIC CEMENT, SUFFICIENT WATER TO FORM A PUMPABLE SLURRY, AND A MINOR BUT EFFECTIVE AMOUNT, SUFFICIENT TO REDUCE THE WATER LOSS FROM SAID SLURRY TO A PREVIOUS FORMATION, BUT INSUFFICIENT TO RETARD THE TIME OF INITIAL SET TO 24 HOURS, OF 0.3 TO 6 PERCENT BY WEIGHT OF THE DRY HYDRAULIC CEMENT OF A HYDRAULIC CEMENT WATER LOSS REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF ACID CARBOXYMETHYL CARBOHYDRATE GUM, ACID CARBOXYMETHYL CARBOHYDRATE GUM, AND SALTS OF SAID ACIDS.
Claim 2
Dependent Claim
90 words
A HYDRAULIC CEMENT AQUEOUS SLURRY COMPRISING A MAJOR AMOUNT OF A HYDRAULIC CEMENT, SUFFICIENT WATER TO FORM A PUMPABLE SLURRY, AND A MINOR BUT EFFECTIVE AMOUNT, SUFFICIENT TO REDUCE THE WATER LOSS FROM SAID SLURRY TO A PREVIOUS FORMATION, BUT INSUFFICIENT TO RETARD THE TIME OF INITIAL SET TO 24 HOURS, OF 0.3 TO 6 PERCENT BY WEIGHT OF THE DRY HYDRAULIC CEMENT OF A HYDRAULIC CEMENT WATER LOSS REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF ACID CARBOXYMETHYL CARBOHYDRATE GUM, ACID CARBOXYMETHYL CARBOHYDRATE GUM, AND SALTS OF SAID ACIDS.
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) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |