Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862571 | Method of making a valve sleeve | Thomas Prinz | 1989-09-05 |
| 4799303 | Method of making a valve sleeve | Thomas Prinz | 1989-01-24 |
| 4554817 | Valve sleeve shaping method | — | 1985-11-26 |