Issued Patents All Time
Showing 1–25 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5342444 | Dyestuffs and their use for mass-coloration of plastics | Peter Roschger | 1994-08-30 |
| 5292881 | New naphthalimides, toners containing these and the use of the new naphthalimides as additives for toners | Horst Berneth, Roderich Raue, Jurgen-Rolf Hassdenteufel, Matthias Kocher | 1994-03-08 |
| 5013627 | Electrophotographic toners with cationic charge increasing additive | Roderich Raue | 1991-05-07 |
| 4997740 | Electrophotographic toners with substituted 3-amino-1-imino-isoindolenine salts | Roderich Raue, Klaus Wunderlich | 1991-03-05 |
| 4927729 | Colorless salts of heteropolyacids as charge control substances in toners | Roderich Raue | 1990-05-22 |
| 4919848 | Process for the quenching of fluorescence, and new cationic naphthalene-peri-dicarboxylic acid imide derivatives | — | 1990-04-24 |
| 4841052 | Naphthalic acid imides electrophotographic toners | Roderich Raue | 1989-06-20 |
| 4812379 | Electrophotographic toners containing an additive reinforcing the cationic charge | Roderich Raue | 1989-03-14 |
| 4764622 | Light-collecting coumarin derivatives | Uwe Claussen | 1988-08-16 |
| 4695405 | Process for quenching fluorescence, and new cationic or amphoteric aromatic nitro compounds | Edgar Siegel | 1987-09-22 |
| 4659657 | Chromogenic and fluorogenic esters for photometric or fluorimetric determination of phosphatases or sulphatases | Otto S. Wolfbeis | 1987-04-21 |
| 4614713 | Fluorogenic phosphate esters of hydroxy-pyrene-sulfonic acids for fluorimetric determination of phosphatases | — | 1986-09-30 |
| 4598151 | Cationic dyestuffs, a process for their preparation, and their use for dyeing and mass-coloring | Hans-Peter Kuhlthau | 1986-07-01 |
| 4585598 | Phosphate esters of hydroxy-pyrene-sulfonic acids | — | 1986-04-29 |
| 4544496 | Light-collecting system using coumarin derivatives as energy converters | Uwe Claussen | 1985-10-01 |
| 4526705 | Light-collecting systems and the use of coumarin derivatives as energy converters in them | Frank Arndt, Uwe Claussen, Carl-Wolfgang Schellhammer | 1985-07-02 |
| 4425282 | Preparation of 3-(arylvinyl)-2,2-dimethyl-cyclopropane-1-carboxylic acid esters and new intermediate therefor | Manfred Jautelat, Dieter Arlt, Reinhard Lantzsch, Rainer Fuchs, Hans-Jochem Riebel +1 more | 1984-01-10 |
| 4411946 | Impregnating paper with 7-hydroxy-coumarin compounds | — | 1983-10-25 |
| 4400523 | Process for the preparation of styryl-cyclopropanecarboxylic acid esters and new intermediate products for this process | Manfred Jautelat, Dieter Arlt, Reinhard Lantzsch, Rainer Fuchs, Hans-Jochem Riebel +1 more | 1983-08-23 |
| 4384973 | Dimethine compounds of the coumarin series, a process for their preparation and their use as luminous dyestuffs | — | 1983-05-24 |
| 4384114 | Styryl substituted .GAMMA.-lactone derivatives | Manfred Jautelat, Dieter Arlt, Reinhard Lantzsch, Rainer Fuchs, Hans-Jochem Riebel +1 more | 1983-05-17 |
| 4370486 | Biphenyl compounds, a process for their preparation and their use as intermediate products for optical brighteners, dyestuffs, plastics and medicaments | — | 1983-01-25 |
| 4327025 | Preparation of styryl-cyclopropane-carboxylic acid esters and intermediate therefor | Manfred Jautelat, Dieter Arlt, Reinhard Lantzsch, Rainer Fuchs, Hans-Jochem Riebel +1 more | 1982-04-27 |
| 4325873 | Process for the preparation of styryl-cyclopropanecarboxylic acid esters and intermediate products for this process | Manfred Jautelat, Dieter Arlt, Reinhard Lantzsch, Rainer Fuchs, Hans-Jochem Riebel +1 more | 1982-04-20 |
| 4278795 | Process for the preparation of pyrene compounds | — | 1981-07-14 |