Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6102618 | Large-depth underground drainage facility and method of running same | Kunio Takada, Kenji Otani, Masayuki Yamada, Sumio Sudo, Sadashi Tanaka | 2000-08-15 |
| 5909982 | Large-depth underground drainage facility and method of running same | Kunio Takada, Kenji Otani, Masayuki Yamada, Sumio Sudo, Sadashi Tanaka | 1999-06-08 |
| 5733065 | Underground drainage facility, vertical-shaft multi-stage adjustable vane pump, and method of running drainage pump | Masayuki Yamada, Sumio Sudo | 1998-03-31 |
| 5634740 | Large-depth underground drainage facility and method of running same | Kunio Takada, Kenji Otani, Masayuki Yamada, Sumio Sudo, Sadashi Tanaka | 1997-06-03 |
| 5624226 | Underground drainage facility, vertical-shaft multi-stage adjustable vane pump, and method of running drainage pump | Masayuki Yamada, Sumio Sudo | 1997-04-29 |
| 5487621 | Large-depth underground drainage facility and method of running same | Kunio Takada, Kenji Otani, Masayuki Yamada, Sumio Sudo, Sadashi Tanaka | 1996-01-30 |
| 5360290 | Underground drainage facility, vertical-shaft multi-stage adjustable vane pump, and method of running drainage pump | Masayuki Yamada, Sumio Sudo | 1994-11-01 |