Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868444 | Surface acoustic wave device | Toshiaki Yokoo, Kousuke Takeuchi, Toshiharu Tanaka, Maruo Kamino | 1989-09-19 |
| 4849382 | Lightweight refractory and process for producing the same | Kouichi Kimura, Tomohiko Hara, Tatsuo Takagi | 1989-07-18 |