Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828420 | Interdental tooth cleaning appliance | Masasuke Otsuka, Sumio Kuriyama | 1989-05-09 |
| 4705836 | Polymerization composition containing vinyl benzoic acid or a derivative thereof and a vinyl compound | Masasuke Ohtsuka, Yoshinori Harada, Shigeo Tokita | 1987-11-10 |
| 4411863 | Low-carat corrosion-resistant gold alloy with the skin of the alloy not being blacked upon casting | Masasuke Otsuka, Shinya Nishina | 1983-10-25 |