Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5196518 | Process for the preparation of metallizable azo dyes by carrying out the coupling in the presence of a buffer mixture | Horst Langfeld, Claudio Puebla | 1993-03-23 |
| 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, Claudio Puebla | 1991-06-25 |