Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7910672 | Powder of a vinylpyrrolidone polymer and a process for production thereof | Kazuhiro Okamura, Norihiro Wakao, Keiji Watanabe | 2011-03-22 |
| 7700674 | Vinylpyrrolidone-based polymer composition | Itsuko Hamaguchi, Akio Naka, Daijyo Tomihisa | 2010-04-20 |
| 6829843 | Process for preparing vinylpyrrolidone polymer powder | — | 2004-12-14 |
| 6486281 | Process for preparing high-purity vinylpyrrolidone polymer | Akira Kitada, Itsuko Hamaguchi | 2002-11-26 |
| 6465592 | Process for preparing vinylpyrrolidone polymer | Akira Kitada, Itsuko Hamaguchi | 2002-10-15 |