Issued Patents 1997
Showing 1–2 of 2 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 |