Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5834157 | 2-acylamino-9-arylacridines, process for their preparation and photosensitive mixtures containing them | Klaus Bergmann, Gerhard Buhr | 1998-11-10 |
| 5563018 | (1,2-naphthoquinone 2-diazide) sulfonic acid esters, radiation-sensitive mixture prepared therewith and radiation-sensitive recording material | Gerhard Buhr, Wolfgang Zahn, Fritz Erdmann | 1996-10-08 |
| 5413899 | Light-sensitive mixture containing an 0-naphthoquinonediazide-sulfonic acid ester and recording material produced therewith wherein the 0-naphthoquinone diazides are partial esters | Andreas Elsaesser, Gerhard Buhr, Klaus Bergmann, Wolfgang Zahn | 1995-05-09 |
| 5306595 | Composition containing naphthoquinone diazide sulfonic acid mixed esters and radiation-sensitive recording material prepared therewith | Wolfgang Zahn, Axel Schmitt, Gerhard Buhr | 1994-04-26 |
| 5268252 | Radiation-sensitive ester and process for its preparation | Wolfgang Zahn, Axel Schmitt, Gerhard Buhr | 1993-12-07 |
| 5192640 | Process for preparing 7-hydroxy-1,2-naphthoquinone-2-diazide-4-sulfonic acid or salts thereof | Gerhard Buhr, Klaus Bergmann | 1993-03-09 |
| 5114816 | Radiation-sensitive compounds, radiation-sensitive mixture prepared therewith and copying material | Gerhard Buhr, Helmut Lenz, Klaus Bergmann, Herbert Siegel | 1992-05-19 |
| 5082932 | Process for preparing substituted 1,2-naphthoquinone-(2)-diazide-4-sulfonic acid esters and their use in a radiation-sensitive mixture | Herbert Siegel | 1992-01-21 |
| 5077395 | Substituted 1,2-naphthoquinone-2-diazide-4-sulfonic acids and processes for their preparation and use | Gerhard Buhr, Klaus Bergmann | 1991-12-31 |
| 4590143 | Two-component diazotype material with diazonium salt with anion of benzene or toluene sulfonate | — | 1986-05-20 |
| 4540648 | Two-component diazotype material with ultraviolet light-absorbing dye salt of a benzothiazole | — | 1985-09-10 |
| 4492749 | Diazotype materials with 2-hydroxy-naphthalene having sulfonamide substituent as coupler | — | 1985-01-08 |
| 4457997 | Two-component diazotype material | Klaus Thoese, Hans-Dieter Frommeld | 1984-07-03 |
| 4334004 | Light-sensitive diazotype material with 2-hydroxy-3-naphthoic acid amides having 6-sulfonic acid amide substitution | — | 1982-06-08 |
| 4321373 | 2-Hydroxy-3-naphthoic acid amides | — | 1982-03-23 |
| 4317875 | Recording material containing diazo compounds and process for the manufacture thereof | Klaus Thoese | 1982-03-02 |
| 4207110 | Diazotype material | Heinz Schafer | 1980-06-10 |