Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6269522 | Method of operating a card and a card flat for carrying out the method | Ralph A. Graf | 2001-08-07 |
| 5797788 | Grinding a mounted card clothing | Ralph A. Graf | 1998-08-25 |