Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6820333 | Method of converting storage pumps into reversible pump-turbines | Katsumasa Shimmei | 2004-11-23 |
| 5938403 | Runner, water wheel and method of manufacturing the same | Ryoji Okada, Keiji Taguchi, Kiyohito Tani | 1999-08-17 |
| 4708594 | Method of starting a variable-speed pump turbine or a variable speed pump | Katsumasa Shinmei | 1987-11-24 |