Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5322558 | Neutralizing agent for paper products | Jurgen Wittekind, Peter Schwerdt, Karl-Heinz Scherer, Rolf-Erhard Schmitt | 1994-06-21 |
| 5277842 | Solvents for agents to mass deacidify books and other paper products in an environmentally safe manner | Juergen Wittekind, Peter Schwerdt | 1994-01-11 |