Patent US2981599A successfully refreshed from Google Patents.
US2981599A
Expired / Lapsed
US
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Process for the production of light voluminous silicates
Assignee: Evonik Operations GmbH
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Filing: 1957-07-05
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Granted: 1961-04-25
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Expires: 1977-07-05
Abstract
No abstract record available.
Inventors
- 👤 Schrauf Robert
- 👤 Frey Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:30
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/22; C01B33/24; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR THE PRODUCTION OF LIGHT VOLUMINOUS POWDERED SILICATES SUITED AS FILLING MATERIALS WHICH COMPRISES REACTING A NATURALLY OCCURRING ALKALI METALALUMINUM DOUBLE SILICATE MINERAL WITH AN ALKALINE EARTH METAL HYDROXIDE IN THE FORM OF AN AQUEOUS SUSPENSION CONTAINING AT LEAST 5 PARTS BY WEIGHT OF WATER PER PART BY WEIGHT OF TOTAL SOLIDS AT SUPERATMOSPHERIC PRESSURE AND A TEMPERATURE BETWEEN 150* AND 280*C. UNTIL A POWDERED SILICATE PRODUCT IS OBTAINED, THE POURED AND SHAKEN WEIGHT OF WHICH IS ABOUT 1/3 TO 1/5 OF THOSE OF THE STARTING MATERIAL, THE QUANTITY OF ALKALINE EARTH METAL HYDROXIDE PRESENT IN SUCH SUSPENSION BEING AT LEAST 0.5 MOL PER MOL OD S1O2 RESENT IN SAID DOUBLE SILICATE.
Claim 2
Dependent Claim
114 words
A PROCESS FOR THE PRODUCTION OF LIGHT VOLUMINOUS POWDERED SILICATES SUITED AS FILLING MATERIALS WHICH COMPRISES REACTING A NATURALLY OCCURRING ALKALI METALALUMINUM DOUBLE SILICATE MINERAL WITH AN ALKALINE EARTH METAL HYDROXIDE IN THE FORM OF AN AQUEOUS SUSPENSION CONTAINING AT LEAST 5 PARTS BY WEIGHT OF WATER PER PART BY WEIGHT OF TOTAL SOLIDS AT SUPERATMOSPHERIC PRESSURE AND A TEMPERATURE BETWEEN 150* AND 280*C. UNTIL A POWDERED SILICATE PRODUCT IS OBTAINED, THE POURED AND SHAKEN WEIGHT OF WHICH IS ABOUT 1/3 TO 1/5 OF THOSE OF THE STARTING MATERIAL, THE QUANTITY OF ALKALINE EARTH METAL HYDROXIDE PRESENT IN SUCH SUSPENSION BEING AT LEAST 0.5 MOL PER MOL OD S1O2 RESENT IN SAID DOUBLE SILICATE.
References Cited (Backward Citations)
US1756624A
Cited
US2742345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |