Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4940514 | Making paper, board and cardboard of high dry strength | Andreas Stange, Hans-Juergen Degen, Werner Auhorn, Michael Kroener, Heinrich Hartmann | 1990-07-10 |
| 4818341 | Production of paper and paperboard of high dry strength | Hans-Juergen Degen, Sigberg Pfohl, Gerd Rehmer, Michael Kroener, Andreas Stange | 1989-04-04 |
| 4784724 | Making paper which has a high dry strength | Sigberg Pfohl, Heinrich Hartmann, Friedrich Linhart | 1988-11-15 |
| 4770743 | Engine size for paper, based on fatty alkyl diketenes and cationic polyacrylamides | Enrique Freudenberg, Hans-Juergen Degen, Ulrich Riebeling | 1988-09-13 |
| 4560745 | Preparation of dyes which contain sulfonic acid groups and have a low electrolyte content | Friedrich Brunnmueller, Manfred Eisert, Rudolf Bermes | 1985-12-24 |
| 4252531 | Process for dyeing wool or nylon fibers | Manfred Daeuble, Hans Georg Schulze | 1981-02-24 |
| 4242187 | Preparation of alkanes substituted by chlorine atoms and/or sulfochloride groups | Helmut Schlecht, Rudi Widder | 1980-12-30 |