Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879367 | Process for the preparation of aliphatic polycarbonates with alkoxy silane initiator | Karl-Erwin Piejko, Hans-Josef Buysch, Michael Hullmann | 1989-11-07 |
| 4806591 | Cationic sizing agents for paper | Joachim Probst, Heinz Baumgen, Joachim Konig, Renke Mottweiler | 1989-02-21 |
| 4800169 | Test aids and method for the preparation thereof | Karl-Erwin Piejko | 1989-01-24 |