Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5821496 | Method of controlling transient recovery voltage and gas insulation switch gear using the same | Eisaku Mizufune, Takashi Sato, Osamu Koyanagi, Yoshihito Asai, Yukio Korosawa | 1998-10-13 |
| 5793597 | Puffer type gas breaker | Eisaku Mizufune, Yukio Kurosawa, Osamu Koyanagi, Yoshihito Asai, Kogi Ishikawa +5 more | 1998-08-11 |
| 5610381 | Compression gas puffer type circuit breaker | Eisaku Mizufune, Kenichi Natsui, Yukio Kurosawa, Goro Daimon, Yoshihito Asai +2 more | 1997-03-11 |
| 4939322 | Puffer type circuit breaker | Minori Sato, Osamu Koyanagi, Yukio Kurosawa | 1990-07-03 |
| 4239948 | Grounded support tank type gas circuit breaker | Masanori Tsukushi, Kunio Hirasawa | 1980-12-16 |
| 4211903 | Electromagnetic puffer type gas circuit breaker | Masanori Tsukushi, Osamu Koyanagi, Yoshio Yoshioka, Kunio Hirasawa | 1980-07-08 |