Patent US3591398A successfully refreshed from Google Patents.
US3591398A
Expired / Lapsed
US
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Process for producing titanium dioxide pigments
Assignee: EIDP Inc
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Filing: 1968-04-05
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Granted: 1971-07-06
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Expires: 1988-04-05
Abstract
Abstract TITANIUM DIOXIDE PIGMENT IS TREATED BY MAINTAINING A WATER SLURRY OF THE PIGMENT AT A PH OF BELOW ABOUT 7 AND APPLYING SILICA IN AN AMOUNT OF 3% TO 10% BY WEIGHT, BASED ON THE PIGMENT, BY ADDING A SOLUTION OF SOLUBLE SILICATE TO THE WATER SLURRY. THE RESULTANT SLURRY IS ADJUSTED TO A PH OF FROM 6-8 AND ALUMINA IN AN AMOUNT OF 1% TO 10% BY WEIGHT, BASED ON THE PIGMENT, IS PRECIPITATED IN THE SLURRY. THE PIGMENT PRODUCED BY THIS TREATMENT HAS GOOD HIDING POWER AND FILM INTEGRITY.
Inventors
- 👤 Albert H Angerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3653; C09C1/3661; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2004/86
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |