Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6635128 | Work hardened poppet exhaust valve | William Neumann, Roger R. Wills, Victor Levin | 2003-10-21 |
| 5618491 | Studs for boilers and other high temperature applications | Clark Champney | 1997-04-08 |
| 5425821 | Iron aluminum based engine intake valves and its manufacturing method | Roger R. Wills, Mark S. Scherer | 1995-06-20 |
| 5328527 | Iron aluminum based engine intake valves and method of making thereof | Roger R. Wills, Mark S. Scherer | 1994-07-12 |
| 5257453 | Process for making exhaust valves | William Neumann, Roger R. Wills, Victor Levin | 1993-11-02 |