Issued Patents 1997
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5693135 | Interference pigments containing reduced titanium oxide layers for preparing forgeryproof documents and packaging | Norbert Mronga, Claus Kaliba, Werner Ostertag, Helmut Schmidt | 1997-12-02 |
| 5662738 | Luster pigments based on multiply coated plateletlike metallic substrates | Norbert Mronga | 1997-09-02 |
| 5626661 | Luster pigments based on multiply coated plateletlike silicatic substrates | Norbert Mronga, Harald Ochmann, Joerg Adel | 1997-05-06 |
| 5624486 | Multiply coated metallic luster pigments | Norbert Mronga | 1997-04-29 |
| 5624487 | Preparation of bluish luster pigments | Helmut Schmidt, Werner Ostertag, Hermann Bidlingmaier, Norbert Mronga, Juan Antonio Gonzalez Gomez +2 more | 1997-04-29 |
| 5607504 | Multiply coated metallic luster pigments | Norbert Mronga | 1997-03-04 |