US2786776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica composition and production thereof
Assignee: Columbia Southern Chemical Corp
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Filing: 1954-12-03
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Granted: 1957-03-26
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Expires: 1974-12-03
Abstract
No abstract record available.
Inventors
- 👤 Edward M Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:09
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; B; B82; B82Y; B82Y30/00; C08; C08K; C08K3/00; C08K3/34; C01; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/60; C01P2004/64; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/12; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
A METHOD OF PREPARING AN ALUMINA-SILICA PIGMENT WHICH COMPRISES REACTING AN ALKALI METAL SILICATE WITH AN ALKALINE EARTH METAL CHLORIDE IN AQUEOUS MEDIUM AND THEREBY PRECIPITATING THE CORRESPONDING ALKALINE EARTH METAL SILICATE HAVING AN AVERAGE ULTIMATE PARTICLE SIZE BELOW ABOUT 1 MICRON, AND THEREAFTER REACTING THE RESULTING ALMINUM SALT HAVING AN ANION WHICH FORMS A WATER SOLUBLE ALKALINE EARTH METAL SALT TO REACT WITH AT LEAST 20 PERCENT OF SAID SILICATE AND TO PRECIPITATE ALUMINA WHEREBY TO PRODUCE A MIXED ALUMINA-SILICA PIGMENT AND A SALT OF SAID ANION AND THE ALKALINE EARTH METAL, AND EXTRACTING A MAJOR PORTION OF THE ALKALINE EARTH METAL SALT FROM THE PIGMENT.
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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) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |