Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5352241 | Process for retanning mineral tanned leathers with aromatic sulphonic acids | Franz Schade, Wilhelm Krummel, Henricus Slaats | 1994-10-04 |
| 5340365 | Process for producing chrome leather | Franz Schade, Joachim Kochta, Herbert Burkhardt, Peter Schindlmayr | 1994-08-23 |
| 4919680 | High-extraction chrome tanning process | Bernd Makowka, Heinz Klein, Gertrud A. Klein, Helga Rosentreter | 1990-04-24 |
| 4834763 | Process for the retanning of chrome leathers | Josef Muller, Helga Rosentreter | 1989-05-30 |
| 4447651 | 1,4-Bis-(4-chloro-2-methoxystyryl)-benzene | Carl-Wolfgang Schellhammer | 1984-05-08 |
| 4447244 | Process for mass-dyeing of thermoplastics: polystyrene and styrene copolymers with indoline methine dyes | — | 1984-05-08 |
| 4289887 | Benzofurane benzoxazoles | — | 1981-09-15 |
| 4271293 | Benzofuranyl-benzimidazoles | Josef Bremen, Carl-Wolfgang Schellhammer | 1981-06-02 |
| 4268670 | Process for the preparation of benzimidazolylbenzofuranes | Josef Bremen | 1981-05-19 |
| 4252720 | Pyrazoline compounds | Carl-Wolfgang Schellhammer | 1981-02-24 |