Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4447350 | Mixtures of optical brighteners and their use | Thomas Martini, Erich Schinzel, Hans Frischkorn, Herbert Friedrich | 1984-05-08 |
| 4416795 | Mixtures of optical brighteners | Thomas Martini, Hans Frischkorn, Erich Schinzel | 1983-11-22 |
| 4363744 | Mixtures of optical brighteners and their use for the optical brightening | Dieter Gunther, Rudiger Erckel, Gunter Rosch | 1982-12-14 |
| 4336155 | Mixtures of optical brighteners | Thomas Martini, Rudiger Erckel, Horst Fruhbeis, Gunter Rosch | 1982-06-22 |
| 4330427 | Mixtures of optical brighteners | Thomas Martini, Rudiger Erckel, Horst Fruhbeis, Gunter Rosch | 1982-05-18 |
| 4231741 | Mixtures of optical brighteners | Dieter Gunther, Rudiger Erckel, Gunter Rosch | 1980-11-04 |