Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5607544 | Process and agent for the oxidative bleaching of wood pulp and for deinking waste paper | Wolfram Salzburger, Silke Eifler | 1997-03-04 |
| 5228953 | Deinking waste paper using a polyglycol and a phosphoric ester mixture | Inge Bast | 1993-07-20 |
| 4752354 | Process and composition for bleaching wood pulp | Harald Beurich | 1988-06-21 |
| 4487655 | Process of and composition for de-inking waste paper as well as paper reclaimed by said process | Siegfried N/o/ etzel, Heinz Ballreich | 1984-12-11 |