Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879408 | Cycloaliphatic diisocyanates optionally in the form of isomer mixtures and a process for their production | Hartmut Knofel, Michael Brockelt, Stefan Penninger | 1989-11-07 |
| 4879409 | Cycloaliphatic diisocyanates, optionally in the form of isomeric mixtures and a process for their preparation | Hartmut Knofel, Michael Brockelt, Stefan Penninger | 1989-11-07 |
| 4847408 | Process for the preparation of (cyclo)aliphatic diisocyanates | Hans-Georg Frosch, Heinrich Grave, Eckart Waldau, Peter Fuhrmann | 1989-07-11 |