Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874797 | Oligourea polyols, polyether polyols produced from them and the use of these polyols in the isocyanate polyaddition process | Claus-Dieter Sommerfeld, Hans-Ulrich Weber | 1989-10-17 |
| 4797430 | Amine-modified polyurethane (urea) foams and a process for their production | Hans-Joachim Kogelnik | 1989-01-10 |