Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818809 | Aromatic sulfide amide polymer and a process for the production thereof | Tomohiro Ishikawa | 1989-04-04 |
| 4804726 | Manufacturing method of polyolefin | Mitsuhiro Mori, Morihiko Sato, Toshikazu Chikusa, Hitoshi Ito | 1989-02-14 |