Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889671 | Production method of prefoamed particles of polyolefin resin | Hiroyuki Akiyama, Susumu Izawa, Toru Yamaguchi | 1989-12-26 |
| 4840973 | Polypropylene resin prefoamed particles | Shohei Yoshimura | 1989-06-20 |