Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5603757 | Photochromic brightening pigment | Katsumi Mizuguchi, Keizou Ishii | 1997-02-18 |
| 5603986 | Method of preparing microcapsules | Tsuyoshi Imamura, Takahiro Mukae, Keizou Ishii | 1997-02-18 |