Issued Patents 2002
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6498231 | Vinylpyrrolidone polymer and its stabilization and preservation processes | Daijo Tomihisa, Tomiyasu Ueta, Akio Naka, Hideyuki Nishibayashi, Yoshitomo Nakata | 2002-12-24 |
| 6391994 | Production process for vinylpyrrolidone polymer | Daijo Tomihisa, Nobuyuki Harada, Akio Naka, Yuuji Shimasaki, Hideyuki Nishibayashi | 2002-05-21 |
| 6346600 | Vinylpyrrolidone polymer and its stabilization and preservation processes | Daijo Tomihisa, Tomiyasu Ueta, Akio Naka, Hideyuki Nishibayashi, Yoshitomo Nakata | 2002-02-12 |