Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5342974 | Halogenated anthraquinone and their use as near infrared rays absorbing optical filters | Tsukasa Ohyama, Shizuo Kuroda, Keisuke Takuma | 1994-08-30 |
| 4883611 | Dichroic coloring agents for liquid crystal displays | Keisuke Takuma, Sizuo Kuroda, Tsukasa Oyama | 1989-11-28 |
| 4734218 | Dichroic azo dyestuffs and liquid crystal composition containing said dyestuffs | Keisuke Takuma, Kimitoshi Kato, Yasuyuki Yamada, Tsutomu Nishizawa | 1988-03-29 |
| 4628091 | Process for producing dianthraquinone-N,N'-dihydrazine and its chlorination product | Kimitoshi Kato, Tamio Mikoda, Tunehiro Sakai | 1986-12-09 |