Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D290105 | Automobile tire | Tadanobu Nagumo, Riichiro Mama, Tadashi Harashima, Izumi Kuramochi | 1987-06-02 |
| 4649975 | Pneumatic tire tread | Tomohiko Kogure, Riichiro Mama, Nobuhito Takasugi | 1987-03-17 |