Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871501 | Process for melt spinning aromatic polyester | Kazuo Hayatsu, Toshiyuki Kobashi, Seiji Takao | 1989-10-03 |
| 4865790 | Process for producing aromatic polyester fiber | Kazuo Hayatsu, Toshiyuki Kobashi, Seiji Takao, Jun Takagi | 1989-09-12 |