US3560234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of pigments of titanium dioxide in the rutile form
Assignee: Thann and Mulhouse SA
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Filing: 1969-03-03
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Granted: 1971-02-02
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Expires: 1989-03-03
Abstract
Abstract A TITANIUM DIOXIDE RUTILE PIGMENT OF GOOD BRIGHTNESS, COLOUR, AND OTHER FAVOURABLE PROPERTIES IS MADE BY ADDING A RUTILE SEED TO A TITANIUM SULPHATE SOLUTION, HYDROLYSING THE TITANIUM SULPHATE TO A HYDROUS TITANIUM DIOXIDE GEL, ADDING FURTHER RUTILE SEED (PREFERABLY PREPARED IN A DIFFERENT WAY), AN ALKALI METAL COMPOUND, A ZINC COMPOUND, AND AN UNUSUALLY HIGH PROPORTION OF PHOSPHORIC ACID OR A PHOSPHATE, DRYING THE GEL CONTAINING THE ADDITIVES, AND CALCINING IT, PREFERABLY AT ABOUT 1000*C.
Inventors
- 👤 Raymond G Holbein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:59
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C09C3/00; C09C3/04; C09C3/043; C09C3/06; C01; C01P; C01P2006/00; C01P2006/22; C01P2006/60; C01P2006/80
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |