Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997917 | Preparation of 1:2 chromium complex azo dyes asymmetrically substituted with solubilizing | Walter Iff, Hans Schaller | 1991-03-05 |
| 4996303 | Preparation of 1:2 metal complex dyes by coupling in the presence of a metal donor in an inert gas atmosphere | Alois Puntener | 1991-02-26 |
| 4933437 | Preparation of 1:2 chromium complex azo dyes asymmetrically substituted with solubilizing groups | Walter Iff, Hans Schaller | 1990-06-12 |
| 4408287 | Automatic-search microfiche reader involving the use of a microcomputer | Dominique Mariaulle | 1983-10-04 |