Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5668531 | Synchronized alarm holding system | Kiyoshi Sukegawa | 1997-09-16 |
| 5639165 | Method of operating pump and bearing device for pump | Kohji Aizawa, Akira Yamaguchi, Shigenobu Nagasawa, Shiro Matsui, Yoshiaki Chiba | 1997-06-17 |
| 5634740 | Large-depth underground drainage facility and method of running same | Kenji Otani, Masayuki Yamada, Saburo Maru, Sumio Sudo, Sadashi Tanaka | 1997-06-03 |
| 5603587 | Drainage water pumping station and method for operating the same | Kenji Otani, Sadashi Tanaka | 1997-02-18 |