US3556828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating titanium dioxide pigments
Assignee: Laporte Titanium Ltd
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Filing: 1968-01-22
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Granted: 1971-01-19
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Expires: 1988-01-22
Abstract
Abstract A PROCESS FOR TREATING TITANIUM DIOXIDE PIGMENTS CONTAINING ALUMINA TO INCREASE THE DURABILITY CHARACTERISTICS OF THE PIGMENT WHICH INCLUDES THE STEPS OF FORMING AN AQUEOUS SLURRY OR PASTE OF THE PIGMENT, MAINTAINING THE PIGMENT IN SLURRY FORM FOR A PERIOD OF TIME AND THEREAFTER ADDING TO THE SLURRY AT LEAST ONE PHOSPHORUS-CONTAINING DISPERSING AGENT TO FORM A DISPERSION OF THE TITANIUM DIOXIDE PIGMENT. CONVENTIONAL PROCEDURES MAY THEN BE USED TO RECOVER THE PIGMENT FROM SAID DISPERSION.
Inventors
- 👤 George G Durrant
- 👤 Ernest Brunskill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:00
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C09C3/00; C09C3/06; C09C3/063; C09C3/08; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/80
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |