US2946660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing siliceous pigments
Assignee: Columbia Southern Chemical Corp
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Filing: 1957-11-01
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Granted: 1960-07-26
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Expires: 1977-11-01
Abstract
No abstract record available.
Inventors
- 👤 Edward L Priebe
- 👤 Joseph A Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:37
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF PURIFYING ACID PRECIPITATED, FINELY DIVIDED, FILTERABLE SILICA CONTAINING IMPURITIES IN THE FORM OF CATIONS WHICH COMPRISES SUBJECTING THE FILTERABLE SILICA TO THE ACTION OF AN ION EXCHANGE RESIN IN THE HYDROGEN FROM AND AN AQUEOUS MEDIUM CONTAINING A SMALL AMOUNT OF AN ADDED WATER SOLUBLE METAL SALT, THE SALT AND ION EXCHANGE RESIN BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCED THE PH OF TH SILICA BELOW 6, ALLOWING THE RESIN IN THE HYDROGEN FROM TO ABSORB THE IMPURITIES IN THE FROM OF IONS, AND THEN SEPARATING THE RESIN TO OBTAIN AN AQUEOUS SLURRY OF FILTERABLE SILICA HAVING A PH BELOW 6.
Claim 2
Independent Claim
105 words
A METHOD OF PURIFYING ACID PRECIPITATED, FINELY DIVIDED, FILTERABLE SILICA CONTAINING IMPURITIES IN THE FORM OF CATIONS WHICH COMPRISES SUBJECTING THE FILTERABLE SILICA TO THE ACTION OF AN ION EXCHANGE RESIN IN THE HYDROGEN FROM AND AN AQUEOUS MEDIUM CONTAINING A SMALL AMOUNT OF AN ADDED WATER SOLUBLE METAL SALT, THE SALT AND ION EXCHANGE RESIN BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCED THE PH OF TH SILICA BELOW 6, ALLOWING THE RESIN IN THE HYDROGEN FROM TO ABSORB THE IMPURITIES IN THE FROM OF IONS, AND THEN SEPARATING THE RESIN TO OBTAIN AN AQUEOUS SLURRY OF FILTERABLE SILICA HAVING A PH BELOW 6.
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) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |