Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6936078 | Fluorescent brightener pigment compositions | Peter Bischof, Christiane Hutter | 2005-08-30 |
| 5196518 | Process for the preparation of metallizable azo dyes by carrying out the coupling in the presence of a buffer mixture | Horst Langfeld, Gunter Sereinig | 1993-03-23 |
| 5153140 | Process for controlling and optimising industrial processes for the preparation of dyes, fluorescent whitening agents and their intermediates | Horst Langfeld, Roland Minges, Wilhelm Schmidt | 1992-10-06 |
| 5026830 | Process for the preparation of azo dyes by carrying out coupling in the presence of an alkali metal chloride and ammonium chloride | Horst Langfeld, Gunter Sereinig | 1991-06-25 |