Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7369221 | Portable refractometer | Hideyuki Amamiya, Yasuhiko Amagasa, Mitsuru Murata | 2008-05-06 |
| D554549 | Refractometer | Hideyuki Amamiya, Yasuhiko Amagasa | 2007-11-06 |
| D334728 | Portable planter for growing small plants | Shozo Ishiyama, Takako Inose | 1993-04-13 |