Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880756 | Silicon nitride sintered product | Kazuhiro Urashima, Masakazu Watanabe, Kenji Nakanishi | 1989-11-14 |
| 4829374 | Surface inspection apparatus | Seiichi Miyamoto, Masaru Hanatani | 1989-05-09 |