Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4749725 | Production process of pre-foamed particles | Hiroyuki Akiyama, Takashi Kubota, Koji Iizuka, Hisao Tokoro | 1988-06-07 |
| 4716021 | Heat treatment apparatus for polyolefin resin particles | Hiroyuki Akiyama, Susumu Izawa, Toru Yamaguchi | 1987-12-29 |