Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5646386 | Vacuum interrupter | Mitsumasa Yorita, Hiroshi Hasegawa, Kenichi Koyama | 1997-07-08 |
| 5597993 | Vacuum interrupter | Mitsumasa Yorita, Hiroshi Hasegawa, Kenichi Koyama | 1997-01-28 |
| 5585696 | High current density glow discharge switch | Ken-ichi Koyama | 1996-12-17 |
| 5495085 | Vacuum interrupter | Mitsumasa Yorita, Hiroshi Hasegawa, Kenichi Koyama | 1996-02-27 |
| 5133241 | Electromagnetic rail launcher | Kenichi Koyama | 1992-07-28 |
| 4937698 | System for foreseeing deterioration in interrupting performance of vacuum interrupter | Tatsuya Hayashi | 1990-06-26 |
| 4924102 | Apparatus for generating negatively charged species | Hiroyuki Sasao, Tatsuya Hayshi | 1990-05-08 |
| 4855547 | Vacuum interrupter | Tatsuya Hayashi | 1989-08-08 |
| 4746783 | Welding current control circuit for spot welder | Yoshikazu Shibuya | 1988-05-24 |