Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4900717 | Recovery of 2,6-dialkyl-naphthalene isomers | Wilhelm Holtmann, Robert Zellerhoff, Peter Staglich, Bernhard Charpey | 1990-02-13 |
| 4871443 | Novel method for extraction of salts from coal tar and pitches | Herbert Beneke, Arnold Alscher, Siegfried Peter, Wolfgang Jaumann | 1989-10-03 |
| 4523016 | Process for the catalytic dehydrogenation of piperidine | Georg Grigoleit, Jurgen Stadelhofer, Kurt Matern | 1985-06-11 |
| 4304606 | Plasticized coal tar pitch, composition containing same and its use | Heinrich Louis, Helmut Kohler, Gerd Collin, Volker Potschka | 1981-12-08 |