US2949379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing finely divided alumina-silica pigments
Assignee: Columbia Southern Chemical Corp
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Filing: 1957-03-18
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Granted: 1960-08-16
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Expires: 1977-03-18
Abstract
No abstract record available.
Inventors
- 👤 Mathias P Boland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:03
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/405; C01; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/12; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE METHOD WHICH COMPRISES PARTIALLY REACTING IN AQUEOUS MEDIA A FINELY DIVIDED ALKALINE EARTH METAL SILICATE HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF LESS THAN 1 MICRON WITH FROM 30 TO 70 PERCENT OF STOICHIOMETRIC OF WATER SOLUBLE ALUMINUM SALT HAVING AN ANION WHICH FORMS A WATER SOLUBLE ALKALINE EARTH METAL SALT, SEPARATING THE RESULTING COMPOSITION, AND REACTING SAID COMPOSITION WITH SUFFICIENT WATER SOLUBLE ALUMINUM SALT TO REACT WITH AT LEAST HALF THE ALKALINE EARTH METAL OXIDE PRESENT IN SAID COMPOSITION IN AQUEOUS MEDIA WHEREBY TO FORM A PIGMENTARY FINELY DIVIDED ALUMINA-SILICA COMPOSITION.
Claim 2
Independent Claim
93 words
THE METHOD WHICH COMPRISES PARTIALLY REACTING IN AQUEOUS MEDIA A FINELY DIVIDED ALKALINE EARTH METAL SILICATE HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF LESS THAN 1 MICRON WITH FROM 30 TO 70 PERCENT OF STOICHIOMETRIC OF WATER SOLUBLE ALUMINUM SALT HAVING AN ANION WHICH FORMS A WATER SOLUBLE ALKALINE EARTH METAL SALT, SEPARATING THE RESULTING COMPOSITION, AND REACTING SAID COMPOSITION WITH SUFFICIENT WATER SOLUBLE ALUMINUM SALT TO REACT WITH AT LEAST HALF THE ALKALINE EARTH METAL OXIDE PRESENT IN SAID COMPOSITION IN AQUEOUS MEDIA WHEREBY TO FORM A PIGMENTARY FINELY DIVIDED ALUMINA-SILICA COMPOSITION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |