Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5609554 | Conductive roll | Keita Shiraki, Takafumi Yamamoto | 1997-03-11 |
| 5604031 | Electrically conductive roll whose base layer is formed of ion-conductive elastic material | Takafumi Yamamoto, Sumio Oinuma, Kazutoshi Soumiya, Hiroyasu Kato | 1997-02-18 |