Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5352774 | Dyes containing thiophene radicals | Guenter Hansen, Karl-Heinz Etzbach, Helmut Reichelt, Hermann Loeffler | 1994-10-04 |
| 5283326 | Dyes containing thiophene radicals | Guenter Hansen, Karl-Heinz Etzbach, Helmut Reichelt, Hermann Loeffler | 1994-02-01 |