Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5085837 | Method for purifying TiO.sub.2 ore by alternate leaching with an aqueous solution of an alkali metal compound and an aqueous solution of mineral acid | Tze-Hsiang Chao | 1992-02-04 |
| 5011666 | Method for purifying TiO.sub.2 ore | Tze-Hsiang Chao | 1991-04-30 |
| 4286998 | Light stable quinacridonequinone yellow pigment | Wilfried G. Holtje, Arthur J. Taggi | 1981-09-01 |