Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4725690 | Perylene-3,4,9,10-tetracarboxylic acid diimide dye | — | 1988-02-16 |
| 4667417 | Preparation of aerogels | Andreas Stange | 1987-05-26 |
| 4517270 | Electrophotographic recording medium | Gerhard Hoffmann, Reinhold J. Leyrer, Peter Neumann, Manfred Patsch | 1985-05-14 |
| 4451654 | Conditioning of finely divided crude organic pigments | Gerhard Wickenhaeuser | 1984-05-29 |
| 4450273 | NN' Para methoxy benzyl perylene-3,4,9,10-tetracarboxylic acid diimide | — | 1984-05-22 |
| 4446324 | Perylenetetracarboxylic acid diimides and their use | — | 1984-05-01 |
| 4429029 | Organic electrophotographic recording medium | Gerhard Hoffmann, Reinhold J. Leyrer | 1984-01-31 |
| 4419427 | Electrophotographic medium with perylene-3,4,9,10-tetracarboxylic acid N,N'-bis-(2',6'-dichlorophenyl)-diimide | Gerhard Hoffmann, Reinhold J. Leyrer, Peter Neumann | 1983-12-06 |
| 4379934 | Process for two-dimensionally concentrating light, and novel perylene-3,4,9,10-tetracarboxylic acid diimides | Guenther Seybold | 1983-04-12 |
| 4368582 | Process for drying finely divided pigments | Gerhard Wickenhaeuser | 1983-01-18 |
| 4262851 | Process for converting crude and/or coarsely crystalline perylenetetracarboxylic acid diimides to a pigmentary form | Paul Guenthert | 1981-04-21 |
| 4240793 | Preparation of a high-hiding and deeply colored pigmentary form of perylene-3,4,9,10-tetracarboxylic acid bis-(4'-ethoxyphenyl)-imide | — | 1980-12-23 |