Issued Patents All Time
Showing 26–43 of 43 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4542223 | Process for the preparation of cationic methine dyestuffs | Hans-Peter Kuhlthau, Klaus-Friedrich Lehment | 1985-09-17 |
| 4513142 | Preparation of cationic methine dyestuffs | Volker Huhne, Hans-Peter Kuhlthau | 1985-04-23 |
| 4496719 | 3H-Indol-2-yl cationic hydrazone dyestuffs | — | 1985-01-29 |
| 4426530 | Triazolylcoumarin compounds, and their preparation and use as optical brighteners, scintillators and laser dyestuffs | Horst Berneth | 1984-01-17 |
| 4419511 | Process for the preparation of trimethine dyestuffs | — | 1983-12-06 |
| 4400321 | Process for the preparation of solutions of cationic polyazo dyestuffs | Karl Linhart, Harald Gleinig, Hans-Peter Kuhlthau | 1983-08-23 |
| 4376728 | Process for the preparation of cationic alkylarylhydrazone dyestuffs and color bases thereof | Hans-Peter Kuhlthau | 1983-03-15 |
| 4349670 | Process for the preparation of cationic dyestuffs | Heinz Giesecke | 1982-09-14 |
| 4338258 | Fluorescent dyestuffs, processes for their preparation and their use as laser dyestuffs | Wolfgang Brinkwerth, Wolfgang Huffer, Rudolf Schieder, Helmut Telle | 1982-07-06 |
| 4326066 | Triazolyl coumarin compounds, processes for their preparation and their use as whiteners and laser dyestuffs | Udo Eckstein, Carl-Wolfgang Schellhammer | 1982-04-20 |
| 4301091 | Fluorescent dyestuffs | Rudolf Schieder, Helmut Telle, Wolfgang Brinkwerth | 1981-11-17 |
| 4281112 | Process for the preparation of cationic dyestuffs | Klaus-Friedrich Lehment, Harald Gleinig | 1981-07-28 |
| 4274062 | Dyestuff laser | Uwe Brinkmann, Helmut Telle, Carl-Wolfgang Schellhammer | 1981-06-16 |
| 4271395 | Dyestuff laser | Uwe Brinkmann, Helmut Telle | 1981-06-02 |
| 4256882 | Reactive dyestuffs | Adolf Friedrich, Horst Harnisch | 1981-03-17 |
| 4256900 | Fluorescent azolyl benzocoumarin dyestuffs | — | 1981-03-17 |
| 4248775 | Preparation of solutions of azo methine basic dyestuffs | — | 1981-02-03 |
| 4211436 | Pressure-sensitive recording material | Hans-Peter Kuhlthau, Hubertus Psaar | 1980-07-08 |