Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5623040 | Polymerisable photochromic naphthacenediones, polymers of these monomers, process for their preparation and the use thereof | Walter Fischer | 1997-04-22 |
| 5432049 | Photochromic composition | Walter Fischer, Jurgen Finter, Kurt Meier, Martin Roth | 1995-07-11 |
| 5310909 | Photochromic compounds, a process for their preparation, and their use | Walter Fischer, Jurgen Finter, Kurt Meier, Martin Roth | 1994-05-10 |
| 5300663 | Photochromic naphthacenequinones, process for their preparation and the use thereof | Walter Fischer, Ernst Minder, Manfred Hofmann, Jurgen Finter, Heinz Spahni | 1994-04-05 |
| 5206395 | Photochromic naphthacenequinones, process for their preparation and the use thereof | Walter Fischer, Ernst Minder, Manfred Hofmann, Jurgen Finter, Heinz Spahni | 1993-04-27 |
| 5177227 | Photochromic naphthacenequinones, process for their preparation and the use thereof | Walter Fischer, Ernst Minder, Manfred Hofmann, Jurgen Finter, Heinz Spahni | 1993-01-05 |