Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4702775 | Preparation of magnetite pigments: control of particle size | Henning Wienand, Roland Bauer | 1987-10-27 |
| 4629616 | Basic chromium aluminum sulfates and their preparation | Henning Wienand, Dietrich Lach, Erwin Hahn | 1986-12-16 |
| 4629513 | Preparation of transparent golden yellow, thermally stable two-phase pigments of the general formula xZnO.ZnFe.sub.2 O.sub.4 | Roland Bauer, Gustav Bock | 1986-12-16 |
| 4552593 | Preparation of effect pigments coated with metal oxides | — | 1985-11-12 |
| 4530725 | Preparation of thermally stable lead chromate pigments | Peter Dimroth, Henning Wienand, Egon Liedek, Helmut Knittel, Gunter Etzrodt | 1985-07-23 |
| 4455174 | Yellow pigment containing bismuth vanadate and having the composition BiVO.sub.4.xBi.sub.2 MoO.sub.6.yBi.sub.2 WO.sub.6 | Henning Wienand, Knut Bittler | 1984-06-19 |
| 4344987 | Preparation of flaky mica pigments coated with metal oxides, and use of these pigments | Knut Bittler, Gustav Bock | 1982-08-17 |
| 4328042 | Preparation of metallic pigments having a metallic luster | Knut Bittler, Gustav Bock | 1982-05-04 |
| 4237318 | Manufacture of aqueous methanolic solution of sodium formate | Gerd Wunsch, Volker Kiener, Eckhard Hetzel, Siegfried Schreiner, Bernd Leutner +2 more | 1980-12-02 |