Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4897132 | Turbine casing formed of a heat resistant austenitic cast steel | Masao Yamamoto, Osamu Watanabe, Masayuki Yamada | 1990-01-30 |
| 4493733 | Corrosion-resistant non-magnetic steel retaining ring for a generator | Masao Yamamoto, Mituo Kawai, Koichi Tajima | 1985-01-15 |
| 4431446 | High cavitation erosion resistance stainless steel and hydraulic machines being made of the same | Masao Yamamoto, Mituo Kawai, Kei Honma | 1984-02-14 |
| 4406698 | Martensitic stainless cast steel having high cavitation erosion resistance | Masao Yamamoto, Mituo Kawai, Koichi Tajima | 1983-09-27 |