Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882365 | Polymerizable radiopaque dental composition | Klaus Ellrich | 1989-11-21 |
| 4867790 | Dental composition containing an aziridine compound and method of preparation | Peter Jochum, Wolf-Dietrich Zahler, Gunther Lechner, Klaus Ellrich | 1989-09-19 |
| 4795823 | (Meth)acrylic acid esters and the use thereof for preparing dental compositions | Werner Schmitt, Peter Jochum, Wolf-Dietrich Zahler, Heijo Hubner, Manfred Holupirek +1 more | 1989-01-03 |