Patent US3689295A successfully refreshed from Google Patents.
US3689295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick-setting portland cement
Assignee: Alpha Portland Cement Co
•
Filing: 1971-05-26
•
Granted: 1972-09-05
•
Expires: 1991-05-26
Abstract
Abstract A PORTLAND CEMENT COMPOSITION IS DESCRIBED WHICH IS CAPABLE OF SETTING IN A SHORT PERIOD OF TIME. THE CEMENT COMPOSITION CONTAINS AN ADDITIVE COMPOSED OF AN ETHANOLAMINE AND AN ACETATE, ACETIC ACID OR ACETIC ANHYDRIDE IN AMOUNTS BY WEIGHT BETWEEN ABOUT 0.1% AND 0.4%. THE CEMENT COMPOSITION INCLUDES SULFUR COMBINED AS SO3 IN CONTROLLED AMOUNTS BETWEEN ABOUT 1% AND 2.5% AND HAS A BLAINE FINENESS OF AT LEAST ABOUT 4,000 SQUARE CENTIMETERS PER GRAM. CONCRETE FORMED FROM THIS CEMENT COMPOSITION WILL DEVELOPED A COMPRESSIVE STRENGTH OF AT LEAST ABOUT 125 P.S.I. WITHIN ABOUT TWO HOURS IN MORTAR TESTS.
Inventors
- 👤 Arthur Theodore Hersey
- 👤 James Richard Tonry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:06
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |