Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889756 | Sheet-like, multilayer, laser-optical recording material | Helmut Barzynski, Heidi Benthack-Thomas, Christof Taubitz | 1989-12-26 |
KH
Karl Hellwig
Overall (1989): #90,868 of 140,708Top 65%
1
Patents 1989