Issued Patents All Time
Showing 1–25 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5154770 | Mix-crystal pigments based on perylenetetracarbimides, process for their preparation and their use | Helmut Troster | 1992-10-13 |
| 4831140 | Process for the preparation of arylimides of perylene-3,4,9,10-tetracarboxylic acid | Helmut Troster | 1989-05-16 |
| 4797162 | Process for the preparation of perylene-3,4,9,10-tetracarboxylic acid N,N'- d | Manfred Urban | 1989-01-10 |
| 4769460 | Mix-crystal pigments based on perylenetetracarbimides, process for preparing and their use | Helmut Troster | 1988-09-06 |
| 4758664 | Process for the preparation of linear quinacridones | Frank Prokschy | 1988-07-19 |
| 4758665 | Process for preparing high-hiding gamma-modification of unsubstituted linear transquinacridone | Adolf Kroh | 1988-07-19 |
| 4742170 | Mix-crystal pigments based on perylenetetracarbimides, process for their preparation, and their use | Helmut Troster | 1988-05-03 |
| 4732618 | Powdered pigments with improved rheological properties, processes for their preparation and their use with a content of at least 5% of unsubstituted quinacridone | Adolf Kroh, Otmar Hafner | 1988-03-22 |
| 4714666 | Perylene tetracarboxylic acid imide pigments in an electrophotographic recording material | Wolfgang Wiedemann, Helmut Troester | 1987-12-22 |
| 4709029 | Process for the preparation of perylene-3,4,9,10-tetracarboxylic acid monoanhydride monoimides | Helmut Troster | 1987-11-24 |
| 4705572 | Process for the preparation of pigments of the anthanthrone series | Manfred Urban | 1987-11-10 |
| 4693753 | Pigments of the quinacridonequinone series, process for their preparation and their use | Frank Prokschy | 1987-09-15 |
| 4689087 | Process for the preparation of an organic pigment on the basis of 4,4',7,7'-tetrachloro-thio-indigo | Manfred Urban | 1987-08-25 |
| 4684753 | Process for preparing 1,3,6,8-tetrabromopyrene | Siegfried Schiessler | 1987-08-04 |
| 4655845 | Process for preparing organic pigments having excellent application properties | Manfred Urban | 1987-04-07 |
| 4650879 | Process for the preparation of perylene-3,4,9,10-tetracarboxylic dianhydride | Manfred Urban | 1987-03-17 |
| 4617403 | Process for preparing a pigment based on 4,4',7,7'-tetrachlorothioindigo | Manfred Urban | 1986-10-14 |
| 4614803 | Process for the preparation of dry alkali metal salts of 1,8-naphthalimide | Manfred Urban | 1986-09-30 |
| 4599408 | Perylene-3,4,9,10-tetracarboxylic acid monoanhydride monoimides | Helmut Troster | 1986-07-08 |
| 4599431 | Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid and its 1,8-monoanhydride in a high degree of purity | Siegfried Schiessler | 1986-07-08 |
| 4594420 | Perylene-3,4,9,10-tetracarboxylic acid monoanhydride monoimide and monoimidazolide compounds, processes for their preparation and their use | Helmut Troster | 1986-06-10 |
| 4588814 | Process for the preparation of 3,4,9,10-perylenetetracarboxylic acid diimide | Manfred Urban | 1986-05-13 |
| 4501906 | Monoalkali metal salts of perylene-3,4,9,10-tetracarboxylic acid monoanhydride and process for their manufacturing | Helmut Troster | 1985-02-26 |
| 4496731 | Process for the preparation of perylene-3,4,9,10-tetracarboxylic acid N,N'- d | Manfred Urban | 1985-01-29 |
| 4460410 | Process for the manufacture of a perylene tetracarboxylic acid dianhydride pigment | Manfred Urban | 1984-07-17 |