Issued Patents 1989
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885396 | Process for the preparation of 2-hydroxy-4-(2'-hydroxyethoxy) benzophenones | Erwin Hahn | 1989-12-05 |
| 4883732 | Method of forming printing plate using isoindolenine deratives | Reinhold J. Leyrer | 1989-11-28 |
| 4880718 | Electrophotographic recording element with isoindolenine derivatives | Reinhold J. Leyrer | 1989-11-14 |
| 4876356 | Naphtholactam dyes and optical recording medium containing these days | Matthias Dust, Ernst Schefczik, Heidi Benthack-Thoms, Helmut Barzynski, Klaus D. Schomann +2 more | 1989-10-24 |
| 4873372 | Isolation of 4,4'-dichlorodiphenyl sulfone | Gerhard Schaefer, Heinz Eilingsfeld, Michael Stumpp | 1989-10-10 |
| 4871876 | Preparation of 4,4' dichlorodiphenyl sulfone | Gerhard Schaefer | 1989-10-03 |
| 4865762 | Polymers which form liquid-crystalline phases | Willi Kreuder, Karl-Heinz Etzbach, Hans-Josef Sterzel, Helmut Ringsdorf | 1989-09-12 |
| 4851549 | Pigments | Helmut Flohr, Joachim Jesse, Bernhard Albert | 1989-07-25 |
| 4835273 | Glycoluril derivatives | Alexander Aumueller, Hubert Trauth | 1989-05-30 |
| 4830951 | Naphtholactamsquaric acid dyes and optical recording materials containing these dyes | Matthias Dust, Peter Hauser, 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 Hauser, Gerhard Wagenblast | 1989-05-09 |
| 4820757 | Polymers photostabilized by novel imidazole-2-carboxanilides | Peter Spang, Gerhard Wagenblast, Hubert Trauth | 1989-04-11 |
| 4814256 | Optical recording material | Reinhard Aldag | 1989-03-21 |
| 4806664 | Novel tetraphenyldithiolene complexes, asymmetrically substituted benzoins, and optical recording materials containing the novel complexes | Wolfgang Schrott, Bernhard Albert, Michael Thomas, Helmut Barzynski, Klaus D. Schomann +1 more | 1989-02-21 |