Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9927757 | Toner density sensor and image forming device | Junichi Maekawa, Masato Ueda | 2018-03-27 |
| 9594017 | Reflective sensor | Yoshitaka Taishi, Hiroyuki Miyamoto | 2017-03-14 |
| 9405220 | Optical sensor, image forming device, and method for correcting toner concentration | Yoshitaka Taishi, Junichi Yoshida | 2016-08-02 |
| 8873990 | Toner density sensor and image forming apparatus | Yoshitaka Taishi | 2014-10-28 |
| 5286702 | Phthalide compound and recording material using the compound | Yutaka Muraki, Hidekazu ISHIDA, Katsuhiko Tsunemitsu | 1994-02-15 |
| 5179066 | Thermosensitive recording material | Manabu Yamada, Toshiro Narizuka, Katsuhiko Tsunemitsu, Takayuki Kurosaki | 1993-01-12 |
| 4845245 | Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide | Yoshiharu Fujino, Katsuhiko Tsunemitsu | 1989-07-04 |
| 4835291 | Divinyl compounds and chromogenic recording-material prepared by using thereof | Yoshiharu Fujino, Youji Shimizu, Seiichi Nieda, Kazuhiko Gendai, Katsuhiko Tsunemitsu | 1989-05-30 |
| 4814320 | Heat-sensitive recording material | Masatoshi Taniguchi, Katsuhiko Tsunemitsu | 1989-03-21 |
| 4808567 | Divinyl compounds and chromogenic recording-material prepared by using thereof | Yoshiharu Fujino, Youji Shimizu, Seiichi Nieda, Kazuhiko Gendai, Katsuhiko Tsunemitsu | 1989-02-28 |
| 4747875 | Chromogenic azaphthalide compound and a colour-forming recording composition containing the same | Toshiyuki Nakai, Katsuhiko Tsunemitsu | 1988-05-31 |
| 4564679 | Chromogenic compounds | Yoshiharu Fujino, Yasushi Nakai, Katsuhiko Tsunemitsu | 1986-01-14 |
| 4444591 | Chromogenic compounds and the use thereof as color former in copying or recording materials | Katsuhiko Tsunemitsu, Yoshiharu Fujino, Yoji Shimizu | 1984-04-24 |