Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6222076 | Process for the preparation of substituted cycloketones | Oskar Koch, Harry Erfurt | 2001-04-24 |
| 6042814 | Sulphonic acids and their use as UV absorbers | Oskar Koch, Roland Langner | 2000-03-28 |
| 5585091 | Use of benzazoles UV absorbers, new benzazoles and a process for their preparation | Ralf Pelzer, Roland Langner, Horst Surburg, Horst Sommer, Rudolf Hopp | 1996-12-17 |
| 4192959 | Process for the preparation of pure 2-hydroxybenzyl alcohol, pure 4-hydroxybenzyl alcohol or a mixture of both hydroxy-benzyl alcohols | Kurt Bauer, Reiner Molleken, Karlfried Wedemeyer, Helmut Fiege | 1980-03-11 |