US2794783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colloidal silica products
Assignee: Bayer AG
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Filing: 1953-07-15
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Granted: 1957-06-04
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Expires: 1973-07-15
Abstract
No abstract record available.
Inventors
- 👤 Podschus Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:03
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; B; B82; B82Y; B82Y30/00; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/22; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
IN THE PROCESS FOR THE PRODUCTION OF DISPERSIBLE, COLLOIDAL SILICA-CONTAINING PRODUCTS BY REACTING AN AQUEOUS ALKALI METAL SILICATE SOLUTION WITH AN AQUEOUS SOLUTION OF A METAL SALT FORMING PRECIPITATES WITH ALKALI METAL SILICATE, THE STEPS WHICH COMPRISE MIXING AN ALKALI METAL SILICATE SOLUTION OF A CONCENTRATION OF ABOUT 0.2-0.5 MOL OF ALKALI METAL OXIDE PER LITER WITH A QUANTITY OF AN ALKALINE REACTING SALT SOLUTION IN THE PROPORTION OF 1:1-1:2 REFERRED TO ALKALI METAL OXIDE, SAID ALKALINE REACTING SALT SOLUTION BEING MISCIBLE AT NORMAL TEMPERATURE WITH AN ALKALI METAL SILICATE SOLUTION WITHOUT FORMING PRECIPITATES AND CONSISTING OF ALKALI METAL CARBONATE, THEREAFTER REACTING THE MIXTURE THUS OBTAINED WITH A SOLUTION OF A METAL SALT SELECTED FROM THE GROUP CONSISTING OF ZINC, MAGNESIUM AND ALUMINUM FORMING PRECIPITATES WITH AN ALKALI METAL SILICATE SOLUTION, AND RECOVERING FROM THE REACTION MIXTURE A FINELY DIVIDED PRECIPITATE OF SILICA, METAL HYDROXIDE AND BASIC METAL CARBONATE, THE SINGLE PARTICLES HAVING A DIAMETER BELOW ABOUT 0.02.
Claim 2
Dependent Claim
158 words
IN THE PROCESS FOR THE PRODUCTION OF DISPERSIBLE, COLLOIDAL SILICA-CONTAINING PRODUCTS BY REACTING AN AQUEOUS ALKALI METAL SILICATE SOLUTION WITH AN AQUEOUS SOLUTION OF A METAL SALT FORMING PRECIPITATES WITH ALKALI METAL SILICATE, THE STEPS WHICH COMPRISE MIXING AN ALKALI METAL SILICATE SOLUTION OF A CONCENTRATION OF ABOUT 0.2-0.5 MOL OF ALKALI METAL OXIDE PER LITER WITH A QUANTITY OF AN ALKALINE REACTING SALT SOLUTION IN THE PROPORTION OF 1:1-1:2 REFERRED TO ALKALI METAL OXIDE, SAID ALKALINE REACTING SALT SOLUTION BEING MISCIBLE AT NORMAL TEMPERATURE WITH AN ALKALI METAL SILICATE SOLUTION WITHOUT FORMING PRECIPITATES AND CONSISTING OF ALKALI METAL CARBONATE, THEREAFTER REACTING THE MIXTURE THUS OBTAINED WITH A SOLUTION OF A METAL SALT SELECTED FROM THE GROUP CONSISTING OF ZINC, MAGNESIUM AND ALUMINUM FORMING PRECIPITATES WITH AN ALKALI METAL SILICATE SOLUTION, AND RECOVERING FROM THE REACTION MIXTURE A FINELY DIVIDED PRECIPITATE OF SILICA, METAL HYDROXIDE AND BASIC METAL CARBONATE, THE SINGLE PARTICLES HAVING A DIAMETER BELOW ABOUT 0.02.
References Cited (Backward Citations)
US2428895A
Cited
US2645620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-03 | 1960-12-03 | 1961-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-03 | 1964-12-03 | 1965-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-03 | 1968-12-03 | 1969-06-04 | $7700.00 | Window Closed / Lapsed |