Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8926797 | Method for increasing the dry strength of paper, paperboard, and cardboard | Christian Jehn-Rendu, Hans-Joachim Haehnle, Martin Ruebenacker, Norbert Schall, Thomas Muehlenbernd | 2015-01-06 |
| 8404083 | Process for increasing the dry strength of paper, board and cardboard | Hans-Joachim Haehnle, Christian Jehn-Rendu, Rainer Blum, Norbert Schall, Martin Ruebenacker | 2013-03-26 |
| 8025767 | Wet strength enhancers for paper | Martin Wendker, Stefan Frenzel, Claus Boettcher | 2011-09-27 |
| 7922867 | Method for producing paper, paperboard and cardboard having high dry strength | Norbert Schall, Martin Ruebenacker | 2011-04-12 |