Issued Patents All Time
Showing 1–24 of 24 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845214 | Process for conditioning isoindoline pigments | Reinhard Kemper | 1989-07-04 |
| 4785114 | Quinophthalone dyes | Peter Neumann, Heinrich Kowarsch | 1988-11-15 |
| 4758663 | Isoindoline compound | Hans Scherer, Gustav Bock | 1988-07-19 |
| 4746740 | Isoindoline colorants | Reinhard Kemper | 1988-05-24 |
| 4725685 | Novel isoindoline compounds, their metal complexes and their use as pigments | — | 1988-02-16 |
| 4723023 | Isoindoline dyes | Erwin Hahn, Reinhard Kemper | 1988-02-02 |
| 4719300 | Isoindoline colorants | — | 1988-01-12 |
| 4707548 | Bisisoindoline pigments | Gustav Bock, Peter Neumann | 1987-11-17 |
| 4645539 | Transparent isoindoline pigment having a high color strength | Georg Henning | 1987-02-24 |
| 4599113 | Isoindoline pigment having a high color strength | Georg Henning | 1986-07-08 |
| RE31986 | Manufacture of organic pigments | — | 1985-09-17 |
| 4525591 | 2,4-Dioxotetrahydropyrimido-(1,2-a)-benzimidazole substituted isoindoline dyes and their use | Reinhard Kemper, Ernst Schefczik | 1985-06-25 |
| 4480097 | Isoindoline colorants | Reinhard Kemper | 1984-10-30 |
| 4412949 | Pigments comprising cyanomethylquinazolones coupled to diazo compounds prepared from 1-aminoanthroquinones | Peter Dimroth | 1983-11-01 |
| 4401815 | Isoindoline colorants | Reinhard Kemper, Gustav Bock, Wolfgang Elser | 1983-08-30 |
| 4398027 | Preparation of pigmentary form isoindoline | Peter Hilbert | 1983-08-09 |
| 4371735 | Preparation of pigments having improved technological properties | Hans Scherer, Gustav Bock | 1983-02-01 |
| 4356123 | Sparingly soluble isoinodoline colorants | — | 1982-10-26 |
| 4352932 | Isoindoline colorants | Reinhard Kemper, Ernst Schefczik | 1982-10-05 |
| 4340735 | Isoindoline colorants | Reinhard Kemper | 1982-07-20 |
| 4316023 | Isoindoline colorants | Georg Henning | 1982-02-16 |
| 4311527 | Isoindoline colorants | — | 1982-01-19 |
| 4271301 | Preparation of pigmentary form isoindoline | Peter Hilbert | 1981-06-02 |
| 4271309 | Isoindoline colorants | — | 1981-06-02 |