Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9846200 | Battery state estimation device and storage battery system | Yohei Ishii, Akihiko Yamada | 2017-12-19 |
| 8376897 | Internally geared hub for bicycle | Akihiko Shoge, Tatsushi Okamoto | 2013-02-19 |