Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5017445 | Dry cell | Ryohei Ashihara, Kazuo Sugino, Jun Miyoshi, Masatsugu Eri | 1991-05-21 |
| 4965149 | Metal jacket and dry cell using the same | Ryohei Ashihara, Masayuki Yabuta, Hideaki Yamagishi | 1990-10-23 |
| 4927719 | Dry cell | Ryohei Ashihara, Kazuo Sugino, Jun Miyoshi | 1990-05-22 |