Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9632023 | V-block refractometer | Naoya Kondo | 2017-04-25 |
| 4482245 | Apparatus for measuring the color of a brilliant-cut diamond | Hideki Makabe, Toyoji Yamamoto, Yoshio Matsueda, Yasunori Ito | 1984-11-13 |