Patent US3825438A successfully refreshed from Google Patents.
US3825438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of pigments
Assignee: British Titan Ltd
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Filing: 1972-04-25
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Granted: 1974-07-23
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Expires: 1992-04-25
Abstract
Abstract A PROCESS FOR COATING TITANIUM DIOXIDE PIGMENT WITH AT LEAST ONE HYDROUS OXIDE OF A METAL BY MIXING AN AQUEOUS DISPERSION OF THE PIGMENT WITH AT LEAST ONE WATERSOLUBLE HYDROLYSABLE COMPOUND OF A METAL AND PRECIPITATING A HYDROUS OXIDE ON TO THE PIGMENT IN THE PRESENCE OF AN ALCOHOL AND/OR A CARBOXYLIC ACID, EACH OF WHICH CONTAINS AT LEAST TWO OR MORE HYDROXY GROUPS.
Inventors
- 👤 D Pritchard
- 👤 T Wiseman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:06
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; C01P2004/82; C01P2004/84
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |