Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9096516 | Production method of N-vinyl-2-pyrrolidone | Toru Inaoka, Shigeyuki Nozaki, Yoshihisa Oka | 2015-08-04 |
| 6726811 | Method of purifying N-(2-hydroxyethy)-2-pyrrolidone | Shukichi Ugamura, Hitoshi Yano | 2004-04-27 |