Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882015 | Method for manufacturing a perforated body, friction spinning means using the perforated body and a friction spinning device using the friction spinning means | — | 1989-11-21 |
| 4848079 | Friction spinning drum | Herbert Stalder, Urs Keller, Emil Briner | 1989-07-18 |