Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4933385 | Rubber composition | Hisao Yamamoto, Michio Itoh, Yoichi Watanabe | 1990-06-12 |
| 4818601 | Rubber-cord composite bodies | Michio Itoh, Tadashi Saito, Nobuyuki Okamura, Hisao Yamamoto, Hirohiko Takagi | 1989-04-04 |