Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863617 | Process and apparatus for separating solid-liquid compositions | Yoshihisa Katoh, Takashi Ogawa, Yukihiko Nagao | 1989-09-05 |
| 4839488 | Electric discharge machine using a ceramic filter to filter the working fluid | Yoshihisa Katoh, Takashi Ogawa | 1989-06-13 |