Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6336538 | Fluid coupling | Hirofumi Katoh, Yasuo Fujita | 2002-01-08 |
| 5803221 | Viscous fluid clutch | Shinichi Kawada, Hirofumi Katoh, Yasuo Fujita | 1998-09-08 |
| 5497868 | Viscous fluid clutch | — | 1996-03-12 |
| 4568989 | Mode changing apparatus for a tape recorder | Yoshinori Yamamoto, Masao Ri, Hisanori Watanabe, Yasuo Osada | 1986-02-04 |
| 4547823 | Mode changing apparatus | Masao Ri, Yoshinori Yamamoto, Akira Takada, Hisanori Watanabe, Yasuo Osada | 1985-10-15 |