Patent US3567478A successfully refreshed from Google Patents.
US3567478A
Expired / Lapsed
US
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Process for improving pigmentary metal oxides
Assignee: PPG Industries Inc
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Filing: 1965-07-06
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Granted: 1971-03-02
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Expires: 1985-07-06
Abstract
Abstract PIGMENTARY METAL OXIDES, PARTICULARLY TITANIUM DIOXIDE, ARE PREPARED BY VAPOR PHASE OXIDATION OF CORRESPONDING METAL HALIDES. A METHOD FOR WET TREATING RAW METAL OXIDE TO IMPROVE PIGMENTARY PROPERTIES IS DESCRIBED. THE PROCESS COMPRISES DIGESTING AN AQUEOUS SLURRY CONSISTING ESSENTIALLY OF SUCH OXIDE AT PH LEVELS BELOW 2.0 AND AT TEMPERATURES OF FROM 50*C. TO THE BOILING POINT OF THE SLURRY FOR A PERIOD OF TIME SUFFICIENT TO REDUCE THE SURFACE ACTIVITY OF THE RAW METAL OXIDE.
Inventors
- 👤 Albert Dietz
- 👤 Harry Lott Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:47
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/145; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C09C3/00; C09C3/006; C09C3/06; C09C3/063; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2004/86; C01P2006/00; C01P2006/60; C01P2006/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |