Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887137 | Semiconductor memory device | Masahiro Yoneda, Masahiro Hatanaka, Yoshio Kohno, Hidekazu Oda, Koichi Moriizumi | 1989-12-12 |
| 4875337 | Construction machine dual-dump hydraulic circuit with piloted arm-boom cylinder supply priority switching valves | Genroku Sugiyama, Toichi Hirata | 1989-10-24 |
| 4861908 | Organosilicon compound | Kazutoshi Fujioka | 1989-08-29 |
| 4858649 | Valve apparatus | Toichi Hirata, Genroku Sugiyama, Hideaki Tanaka | 1989-08-22 |
| 4832082 | Hydraulic pilot operated directional control valve | Toichi Hirata, Hideaki Tanaka, Genroku Sugiyama | 1989-05-23 |
| 4801725 | Organosilicon compound | Masatoshi Arai, Kazutoshi Fujioka | 1989-01-31 |