Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4984974 | Screw type vacuum pump with introduced inert gas | Kazuaki Shiinoki, Tadashi Hayakawa, Kiyoshi Masujima, Riichi Uchida, Katsumi Matsubara | 1991-01-15 |
| 4767284 | Screw vacuum pump unit | Kazuaki Shiinoki, Shinji Mitsuhashi, Tadashi Hayakawa, Riichi Uchida | 1988-08-30 |