Issued Patents 1994
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5376615 | Color-developing compositions and their use | Keizaburo Yamaguchi, Kiyoharu Hasegawa, Akihiro Yamaguchi | 1994-12-27 |
| 5364967 | Aromatic diamine compounds, bismalemide compounds, thermosetting resin forming compositions therefrom, resin therefrom, and methods for their preparation | Keizaburo Yamaguchi, Tatsuhiro Urakami, Midori Yamazaki, Shoji Tamai, Norimasa Yamaya +2 more | 1994-11-15 |
| 5326739 | Process for producing 3,5-di(.alpha.-methylbenzyl)salicylic acid derivative, and use of polyvalent-metal-modified product thereof as color developer | Keizaburo Yamaguchi, Akihiro Yamaguchi | 1994-07-05 |
| 5306688 | Salicylic acid derivatives, the process for preparing the same and the heat-sensitive recording materials comprising thereof | Yuki Kobayashi, Atsuo Otsuji, Masakatsu Nakatsuka, Kiyoharu Hasegawa, Kazuyoshi Kikkawa +3 more | 1994-04-26 |
| 5281570 | Thermochromic materials | Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Masakatsu Nakatsuka, Akihiro Yamaguchi | 1994-01-25 |