Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6387296 | Optically brightened plastics for optically brightening paper-coating compounds and paper-coating compounds optically brightened in this manner | Joachim Konig, Fritz Puchner, Ulrich Feldhues, Matthias Kocher, Uwe Vogt +1 more | 2002-05-14 |
| 6339117 | Whitened polymers and the use thereof in coating slips for coating substrates | Siegfried Korte, Ulrich Feldhues, Hans Geiger, Bernhard Hunke, Thomas Roick +1 more | 2002-01-15 |
| 6248887 | Process for preparing bis-alkoxy-triazinyl-amino-containing stilbene disulphonic acids or their derivatives | Ulrich Feldhues, Uwe Vogt, Rolf Brockmann, Dietmar Fiedel | 2001-06-19 |
| 6121444 | Process for preparing substituted 4,4'-diaminostilbene-2,2'-disulphonic acid salts | Ulrich Feldhues, Uwe Vogt, Rolf Brockmann | 2000-09-19 |
| 6025490 | Process for the preparation of substituted 4,4'-diaminostilbene-2,2'-disulphonic acids | Ulrich Feldhues, Rolf Brockmann, Detlef Szeymies | 2000-02-15 |
| 5233048 | Triarylmethane color formers | Roderich Raue | 1993-08-03 |
| 5189188 | Bis(triarylmethane) compounds | — | 1993-02-23 |
| 5097034 | Triarylmethane color formers | — | 1992-03-17 |
| 5094688 | Triarylmethane color-forming agents | Hubertus Psaar, Gert Jabs | 1992-03-10 |
| 4923641 | Highly concentrated stable solutions of color-forming agent: for pressure-sensitive recording materials | Hubertus Psaar | 1990-05-08 |
| 4897223 | Tri-phenyl methyl color-forming agents | Hubertus Psaar, Roderich Raue | 1990-01-30 |
| 4888128 | Paper-coating slips containing fluorescent brighteners | Jochen Koll, Friedhelm Muller, Werner Bieber, Joachim Konig, Hans Theidel | 1989-12-19 |
| 4812569 | Chromogenic phthalides | — | 1989-03-14 |
| 4783196 | Highly concentrated stable solutions of color-forming agents: for pressure-sensitive recording materials | Hubertus Psaar | 1988-11-08 |
| 4670882 | Dyestuff laser | Helmut Telle, Rudolf Schieder, Roderich Raue | 1987-06-02 |
| 4610807 | Distyryl compounds | Wolfgang Brinkwerth | 1986-09-09 |
| 4563532 | Process for the preparation of .DELTA..sup.4 -1,3,4-oxadiazolin-2-one compounds | — | 1986-01-07 |
| 4510311 | Water-insoluble azolystyryl optical brighteners | — | 1985-04-09 |
| 4326066 | Triazolyl coumarin compounds, processes for their preparation and their use as whiteners and laser dyestuffs | Roderich Raue, Carl-Wolfgang Schellhammer | 1982-04-20 |
| 4317782 | Distyryl compounds | Edgar Siegel | 1982-03-02 |
| 4184977 | Fluorescent dyestuffs | Hans Theidel | 1980-01-22 |