Issued Patents All Time
Showing 26–50 of 58 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5296034 | Process for the production of copper phthalocyanine pigment preparations of the .alpha. phase | Erwin Dietz | 1994-03-22 |
| 5275653 | Pigment preparations based on dioxazine compounds | Erwin Dietz | 1994-01-04 |
| 5264034 | Pigment preparations based on perylene compounds | Erwin Dietz | 1993-11-23 |
| 5264032 | Pigment preparations | Erwin Dietz | 1993-11-23 |
| 5248774 | Inner salts based on ammonium and sulfonate groups of perylene-3,4,9,10-tetracarboxylic and derivatives thereof | Erwin Dietz | 1993-09-28 |
| 5123966 | Mixed crystal pigments based on halogenated perylenetetracarboximides | Erwin Dietz | 1992-06-23 |
| 5112404 | Pigment formulations, processes for their preparation and their use | Andreas Sommer, Erwin Dietz | 1992-05-12 |
| 5110931 | Process for the preparation of N,N'-dimethylperylene-3,4,9,10-tetracarboxylic diimide in high-hiding pigment form | Erwin Dietz | 1992-05-05 |
| 5071483 | Process for the preparation of pigment preparations of the anthanthrone series | Erwin Dietz, Siegfried Schiessler | 1991-12-10 |
| 5071482 | Pigment preparations | Erwin Dietz, Siegfried Schiessler | 1991-12-10 |
| 5035747 | Mixed crystal pigments of the anthanthrone series, and preparation and use thereof | Erwin Dietz | 1991-07-30 |
| 4986852 | Pigments and use thereof | Erwin Dietz, Gustav Kapaun, Michael Kappert, Frank Prokschy, Adolf Kroh | 1991-01-22 |
| 4933564 | Method of determining radiation doses by evaluating nuclear tracks in irradiated and subsequently etched foils | Hans Kiefer, Bernd Reinhardt, Gotthard Schleicher | 1990-06-12 |
| 4798627 | Dampening agent for offset printing | Dieter Schmitt | 1989-01-17 |
| 4797162 | Process for the preparation of perylene-3,4,9,10-tetracarboxylic acid N,N'- d | Ernst Spietschka | 1989-01-10 |
| 4717605 | Radiation curable adhesives | Jorg Ohngemach | 1988-01-05 |
| 4705572 | Process for the preparation of pigments of the anthanthrone series | Ernst Spietschka | 1987-11-10 |
| 4704537 | Passive dosimeter | Hans Kiefer | 1987-11-03 |
| 4689087 | Process for the preparation of an organic pigment on the basis of 4,4',7,7'-tetrachloro-thio-indigo | Ernst Spietschka | 1987-08-25 |
| 4683568 | Method of monitoring computer elements, particularly microprocessors | — | 1987-07-28 |
| 4655845 | Process for preparing organic pigments having excellent application properties | Ernst Spietschka | 1987-04-07 |
| 4650879 | Process for the preparation of perylene-3,4,9,10-tetracarboxylic dianhydride | Ernst Spietschka | 1987-03-17 |
| 4617403 | Process for preparing a pigment based on 4,4',7,7'-tetrachlorothioindigo | Ernst Spietschka | 1986-10-14 |
| 4614803 | Process for the preparation of dry alkali metal salts of 1,8-naphthalimide | Ernst Spietschka | 1986-09-30 |
| 4588814 | Process for the preparation of 3,4,9,10-perylenetetracarboxylic acid diimide | Ernst Spietschka | 1986-05-13 |