Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5630849 | Dyeing method | Taiji Kameoka, Isamu Kawamura, Masanobu Ajioka, Keisuke Takuma, Akihiro Yamaguchi +1 more | 1997-05-20 |
| 5567470 | Heat-sensitive transfer sheet containing blue dyestuff | Hitoshi Koshida, Tsukasa Ohyama, Keisuke Takuma | 1996-10-22 |
| 5387686 | Dye for heat-sensitive transfer record and ink composition for heat-sensitive transfer record | Tsukasa Ohyama, Yasushi Shimokawa, Yoriaki Matsuzaki, Keisuke Takuma, Hitoshi Koshida +4 more | 1995-02-07 |
| 5358536 | Dyestuff for heat-sensitive transfer record and transfer sheet containing same | Hitoshi Koshida, Tsukasa Ohyama, Keisuke Takuma | 1994-10-25 |
| 5359075 | Quinophthalone compound | Tsukasa Ohyama, Yasushi Shimokawa, Yoriaki Matsuzaki, Keisuke Takuma, Hitoshi Koshida | 1994-10-25 |
| 5302573 | Transfer sheet for sublimation recording | Tsukasa Ohyama, Yasushi Shimokawa, Keisuke Takuma, Hitoshi Koshida, Akitoshi Igata | 1994-04-12 |
| 5300475 | Sublimation thermal transfer printing sheet comprising novel magenta dyestuffs | Keisuke Takuma, Tsukasa Ohyama, Tamio Mikoda, Hitoshi Koshida, Akitoshi Igata | 1994-04-05 |
| 5296445 | Dye for heat-sensitive transfer record, ink composition for heat-sensitive transfer record, and transfer sheet | Tsukasa Ohyama, Yasushi Shimokawa, Yoriaki Matsuzaki, Keisuke Takuma, Hitoshi Koshida +4 more | 1994-03-22 |
| 5183474 | Heat-sensitive sublimation transfer cyan dye and transfer sheet | Tsukasa Ohyama, Yasushi Shimokawa, Keisuke Takuma, Hitoshi Koshida | 1993-02-02 |
| 5182395 | Isopropyl 1-amino-4-m-toluidinoanthraquinone-2-carboxylate | Keisuke Takuma, Tsukasa Ohyama, Akitoshi Igata, Tamio Mikoda, Hitoshi Koshida | 1993-01-26 |
| 5168093 | Sublimation thermaltransfer printing sheet comprising novel magenta dyestuffs | Keisuke Takuma, Tsukasa Ohyama, Tamio Mikoda, Hitoshi Koshida, Akitoshi Igata | 1992-12-01 |
| 5002925 | Isopropyl 1-amino-4-m-toluidinoanthraquinone-2-carboxylate, cyan composition for sublimation transfer record and cyan composition for color toner containing it | Keisuke Takuma, Tsukasa Ohyama, Akitoshi Igata, Tamio Mikoda, Hitoshi Koshida | 1991-03-26 |
| 4954410 | Color toner composition | Keisuke Takuma, Tsukasa Ohyama, Tamio Mikoda, Hitoshi Koshida, Akitoshi Igata | 1990-09-04 |