Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5157454 | Differential refractometer | Koichi Oka, Akira Kawaguchi, Yasuhiro Kubo | 1992-10-20 |
| 5015094 | Particle size measuring system | Koichi Oka, Akira Kawaguchi, Katsuhiro Morisawa | 1991-05-14 |