Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4363582 | Process for the manufacture of rings for lids for cans | Rudolf Luthi | 1982-12-14 |
| 4333582 | Grooved beverage can lid | Erich Hofling, Rudolf Luthi, Werner Diemi | 1982-06-08 |