Patent US2786777A successfully refreshed from Google Patents.
US2786777A
Expired / Lapsed
US
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Silica composition and production thereof
Assignee: Columbia Southern Chemical Corp
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Filing: 1953-05-18
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Granted: 1957-03-26
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Expires: 1973-05-18
Abstract
No abstract record available.
Inventors
- 👤 Edward M Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:34
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/405; B; B82; B82Y; B82Y30/00; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2004/80; C01P2006/00; C01P2006/12; C01P2006/20; C01P2006/60; C01P2006/80; C01P2006/82; C01P2006/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A METHOD WHICH COMPRISES REACTING ALUMINUM SULIN AQUEOUS MEDIUM, SAID ALKALINE EARTH METAL SILICATE HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF 0.015 TO 1 MICRON, THE AMOUNT OF SAID ALUMINUM SULPHATE BEING AT LEAST SUFFICIENT TO DECOMPOSE AT LEAST 50 PERCENT OF THE ALKALIE EARTH METAL SILICATE AND THEREBY TO CAUSE PECIPITATING OF AL2O3 AND PRODUCTION OF A PRECIPITATE COMPRISING AL2O3 AND SIO2.
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) | 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 |