Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5031878 | Valve seat made of sintered iron base alloy having high wear resistance | Yoshimi Ishikawa | 1991-07-16 |
| 4836848 | Fe-based sintered alloy for valve seats for use in internal combustion engines | Yoshimi Ishikawa | 1989-06-06 |