Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847309 | Method for making foundry sand containing a resin binder | Heinz Auer, Peter Quis | 1989-07-11 |
| 4816558 | Method for making redispersible synthetic resin powders | Hubert Rauch, Klaus Lehmann, Theodor Mager | 1989-03-28 |