Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4965162 | Electrophotographic developer containing tin oxide | Koichi Oyamada | 1990-10-23 |
| 4880719 | Two component electrophotographic developer | Toshiaki Murofushi, Hiroshi Nakazawa, Koichi Oyamada, Yoshimi Amagai, Yasuhiro Ohya | 1989-11-14 |
| 4797340 | Dry electrophotographic toner comprising graft copolymer | Koichi Tanaka, Yoshimi Amagai, Toshiaki Murofushi, Takaaki Kimura | 1989-01-10 |
| 4504563 | Toner for developing electrostatic latent image containing copolymer of vinyl compound and acid monomer | Koichi Tanaka, Hiroshi Takayama, Yoshimi Amagai, Yasuji Fukase | 1985-03-12 |
| 4385107 | Dry toners comprising a colorant and graph copolymer comprising a crystalline polymer and an amorphous polymer and processes using the same | Koichi Tanaka, Yoshimi Amagai, Hiroshi Takayama | 1983-05-24 |
| 4246332 | Electrophotographic toner comprising low and high molecular weight blend of binder resins | Koichi Tanaka, Kenji Kobayashi | 1981-01-20 |
| 4217406 | Cross-linking reaction during melt kneading produces resinous electrophotographic toner | Koichi Tanaka, Kenji Kobayashi | 1980-08-12 |