Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5248784 | 4-carbonyl-substituted coumarin compound | Tsukasa Ohyama, Kazuhiko Murayama, Yoriaki Matsuzaki, Susumu Kasamatsu, Keisuke Takuma | 1993-09-28 |
| 5158703 | Resin composition for ultraviolet luminescent screen | Keisuke Takuma, Shizuo Kuroda, Fumio Matsui | 1992-10-27 |
| 5045434 | Visible radiation sensitive composition containing substituted 3-(benzothiazo-2-yl)-7-diethylaminocoumarin as sensitizers | Ichiro Yoshihara, Motoko Okuhara, Takao Yamamoto, Naozumi Iwasawa, Yasuo Doi +5 more | 1991-09-03 |
| 4734218 | Dichroic azo dyestuffs and liquid crystal composition containing said dyestuffs | Keisuke Takuma, Hiroshi Aiga, Yasuyuki Yamada, Tsutomu Nishizawa | 1988-03-29 |
| 4628091 | Process for producing dianthraquinone-N,N'-dihydrazine and its chlorination product | Hiroshi Aiga, Tamio Mikoda, Tunehiro Sakai | 1986-12-09 |