Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5314321 | Screw-type rotary fluid machine including rotors having treated surfaces | Akihiko Yamamoto, Toshihiro Yamada, Tatsuo Natori, Motohiro Satoo, Mitsuru Fujiwara +3 more | 1994-05-24 |
| 5223052 | Method of treating surfaces of rotors of the screw type rotary machine | Akihiko Yamamoto, Toshihiro Yamada, Tatsuo Natori, Motohiro Satoo, Mitsuru Fujiwara +3 more | 1993-06-29 |
| 4993930 | Vacuum pump apparatus and shaft sealing device therefor | Riichi Uchida | 1991-02-19 |
| 4797068 | Vacuum evacuation system | Tadashi Hayakawa, Kazuaki Shiinoki, Sinji Mitsuhashi | 1989-01-10 |
| 4770609 | Two-stage vacuum pump apparatus and method of operating the same | Riichi Uchida, Seiji Tsuru, Kazuaki Shiinoki | 1988-09-13 |
| 4714418 | Screw type vacuum pump | Katsumi Matsubara, Riichi Uchida, Masatoshi Muramatsu, Tsuneharu Takagi | 1987-12-22 |