Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5352241 | Process for retanning mineral tanned leathers with aromatic sulphonic acids | Wilhelm Krummel, Bernhard Wehling, Henricus Slaats | 1994-10-04 |
| 5340365 | Process for producing chrome leather | Bernhard Wehling, Joachim Kochta, Herbert Burkhardt, Peter Schindlmayr | 1994-08-23 |
| 4737549 | Terpolymers of maleic acid anhydride, (meth)acrylic acid, and (meth)acrylonitrile | Bruno Bomer | 1988-04-12 |
| 4245996 | Condensation products of terphenylsulphonic acids, naphthalenesulphonic acids, bis-(4-hydroxyphenyl) sulphone and formaldehyde | Reinhard Nebeling, Bruno Zinz | 1981-01-20 |