Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4399236 | Process for separating polyurethane hydrolyzates into polyether and diamine | Georg Niederdellmann, Jurgen Schenk, Hartmut Hetzel, Ernst Grigat | 1983-08-16 |
| 4282367 | Process for the separation of polyurethane foam hydrolysates into polyol and diamine | Georg Niederdellmann, Ernst Grigat | 1981-08-04 |