Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5071949 | Process for preparation of polyphenylene-sulfide resins in the absence of specific polymerization assistants | Yoshiaki Nakamura, Yuichiro Shiro, Kazuhiro Kawamata | 1991-12-10 |
| 4841022 | Method for removing impurities from polyphenylene sulfide resin | Yoshiaki Nakamura, Kiichi Marukawa | 1989-06-20 |