US3782991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum sulfate and calcium sulfate additives for improving the quality of cement,mortar and concrete and method for 0he production of such improved products
Assignee: Sika AG
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Filing: 1971-05-11
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Granted: 1974-01-01
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Expires: 1991-05-11
Abstract
Abstract AN ADDITIVE FOR IMPROVING THE PROPERTIES OF BUILDING MATERIALS, SUCH AS CEMENT, CONCRETE AND MORTAR, ESECIALLY FOR INCREASING THE EARLY STRENGTH, THE ABILITY TO CARRY OUT CONCRETING AT LOW TEMPERATURES AND FOR VOLUME CONTROL, WITHOUT IMPAIRING THE OTHER QUALITATIVE PROPERTIES OF THE BUILDING MATERIAL, WHEREIN THE ADDITIVE, APART FROM EXTENDERS AND/OR OTHER ADDITIVE SUBSTANCES CONSISTS OF CALCINATED, ANHYDROUS OR WATER FREE ALUMINUM SULFATE, TECHNIQUES ARE ALSO DISCLOSED FOR PRODUCING THE NOVEL ADDITIVE AS WELL AS FOR PRODUCING SUCH BUILDING MATERIALS WITH IMPROVED PROPERTIES.
Inventors
- 👤 T Burge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:56
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 0
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |