Patent US3597253A successfully refreshed from Google Patents.
US3597253A
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Production of finely divided organically modified water insoluble alkaline earth metal and earth metal silicates
Assignee: Evonik Operations GmbH
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Filing: 1968-01-17
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Granted: 1971-08-03
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Expires: 1988-01-17
Abstract
Abstract PRODUCTION OF ORGANICALLY MODIFIED FINELY DIVIDED ALKALINE EARTH METAL AND EARTH METAL SILICATES AND SILICAS BY WET PRECIPITION OF SUCH SILICATES AND SILICAS FROM ALKALI METAL SILICATE SOLUTIONS WITH AQUEOUS SOLUTIONS OF ALKALINE EARTH METAL OR EARTH METAL SALTS OR ACIDS, PREFERABLY AT TEMPARATURES BETWEEN ABOUT 10 AND 90* C. IN THE PRESENCE OF WATER SOLUBLE REACTIVE POLYMERIC MATERIALS, FOR INSTANCE, POLYMERS CONTAINING THE REACTIVE AMINO, HYDROXYL, CARBOXYL, AMIDE OR KETO GROUPS. THE THUS OBTAINED MODIFIED SILICATES AND SILICAS CAN BE FURTHER MODIFIED BY EFFECTING REACTIONS WITH THE REACTIVE GROUPS OF THE BOUND POLYMERS IN THE SILICATES AND SILICAS.
Inventors
- 👤 Helmut Beschke
- 👤 Hans Pfleger
- 👤 Wilhelm Berndt
- 👤 Peter Nauroth
- 👤 Horst Ferch
- 👤 Edith Eisenmenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:11
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |