Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5195755 | Shaft seal for slurry pumps | Junji Ootsuka, Keizaburo Nishi | 1993-03-23 |
| 5129659 | Shaft seal for slurry pumps | Junji Ootsuka, Keizaburo Nishi | 1992-07-14 |
| 5114160 | Quenching mechanism of shaft seal for slurry pumps | Junji Ootsuka, Keizaburo Nishi | 1992-05-19 |
| 4844483 | Floating seal device | Katsuhiko Iijima, Yasumi Shiraishi, Shoji Mizoe | 1989-07-04 |