Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861437 | Method of manfacturing a mould and providing it with a backing and mould manufactured according to the invention | Claudia Pechtheiden-Meier | 1989-08-29 |
| 4834843 | Method of marking disc-shaped information carriers | Hans Schuddekopf | 1989-05-30 |