Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6468723 | Concentrate comprising a p-phenylenediamine derivative | Gustav Tappe, Gerhard Schmid | 2002-10-22 |
| 6413703 | Color photographic developer concentrate | Gustav Tappe | 2002-07-02 |