Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4846892 | Tetrachloroperylene-3,4,9,10-tetracarboxylic acid diimide pigment and its use | Georg Henning, Erwin Hahn, Manfred Patsch | 1989-07-11 |
| 4830951 | Naphtholactamsquaric acid dyes and optical recording materials containing these dyes | Matthias Dust, Peter Neumann, Gerhard Wagenblast, Heidi Benthack-Thoms, Helmut Barzynski +2 more | 1989-05-16 |
| 4829509 | Optical recording medium, its preparation and its use as a read only memory information carrier | Wolfgang Schrott, Peter Neumann, Gerhard Wagenblast | 1989-05-09 |
| 4814441 | Finely divided transparent metal-free X-phthalocyanine | Volker Radtke | 1989-03-21 |