Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9726612 | Analytical aid | Hans List | 2017-08-08 |
| 9097679 | Analytical aid | Hans List | 2015-08-04 |
| 5482781 | Process for restrengthening damaged paper and product produced thereby | Jurgen Wittekind | 1996-01-09 |
| 5322558 | Neutralizing agent for paper products | Jurgen Wittekind, Rolf Eggersdorfer, Peter Schwerdt, Rolf-Erhard Schmitt | 1994-06-21 |