Issued Patents All Time
Showing 1–3 of 3 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 |
| 5120500 | Process and device for nonpolluting mass deacidification of books and other paper products | Peter Schwerdt, Jurgen Wittekind | 1992-06-09 |