Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5833917 | Process for production of silicon nitride sintered material | Keiichiro Watanabe | 1998-11-10 |
| 5585084 | Silicon nitride powder | Tetsuo Yamada, Takeshi Yamao, Keiichiro Watanabe | 1996-12-17 |