Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5464876 | Process for the recovery of valuable materials during the work-up of polyvinyl chloride | Gunther Lyding, Maria Pille, Joachim Semel | 1995-11-07 |
| 5308600 | Process for conditioning waste sulfuric acid | Wolfram Fritsche-Lang, Horst Lorke | 1994-05-03 |
| 5047558 | Process for the preparation of a dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid | Siegbert Rittner | 1991-09-10 |
| 4925959 | Dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid and process for the preparation thereof | Siegbert Rittner | 1990-05-15 |
| 4916257 | Process for the purification of 2-hydroxynaphthalene-6-carboxylic acid | Siegbert Rittner, Heinrich Volk, Werner Wykypiel, Rudolf Neeb | 1990-04-10 |
| 4794204 | Process for the removal of dimethyl ether in methyl chloride | Hendrik W. Post, Wilhelm Lendle | 1988-12-27 |
| 4479924 | Process for the separation of heavy metal compounds from phosphoric acid | Reinhard Gradl, G/u/ nther Schimmel | 1984-10-30 |
| 4194952 | Process for regenerating waste sulfuric acid | Kurt Bodenbenner | 1980-03-25 |