Quick-setting cement composition containing portland cement,alpha gypsum and a dispersant
Abstract
Abstract CRATERS AND EARTH VOIDS ARE QUICKLY FILLED WITH A HIGHSTRENGTH, QUICK-SETTING CEMENT COMPOSITION COMPRISING A MIXTURE OF CEMENT MATERIAL CONSISTING ESSENTIALLY OF FROM ABOUT 9.5 TO ABOUT 4 PARTS BY WEIGHT OF CALCIUM SULFATE HEMIHYDRATE TO ABOUT 0.5 TO ABOUT 6 PARTS BY WEIGHT OF PORTLAND CEMENT AND WATER WHICH IS PRESENT IN A QUANTITY OF FROM ABOUT 22% TO ABOUT 70% BY WEIGHT. ACCORDING TO THE DESIRED USES THEREFOR, ACCELERATORS, RETARDANTS OR DISBURSANTS ARE ADDED TO THE MIXTURE. THE PREFERRED QUICK-SETTING CEMENT COMPOSITION OF THIS INVENTION CONSISTS OF FROM 9.5 TO 7 PARTS BY WEIGHT OF ALPHA GYPSUM TO 0.5 TO 30 PARTS BY WEIGHT OF PORTLAND CEMENT ALONG WITH FROM ABOUT 22% TO ABOUT 40% WATER BY WEIGHT, BASED UPON THE CEMENT MATERIAL.
Inventors
- 👤 Thomas S Ames
Bibliographic Details
Claims Analysis
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |