Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8118881 | Hair dye and hair dye composition | Masahiko Yamaguchi, Shiro Irisa, Eiji Takahashi | 2012-02-21 |
| 5041560 | Fluoran compound | Masahiko Yamaguchi, Michihiro Gonda | 1991-08-20 |
| 4987262 | Cycloalkene compounds useful in recording materials | Wakasugi Kazuyuki, Masahiko Yamaguchi, Katsuichi Motohashi | 1991-01-22 |
| 4839334 | Heat sensitive recording sheet | Toshiyuki Abe, Michihiro Gonda, Hideyuki Sensui, Mikiko Kanasugi | 1989-06-13 |
| 4642663 | 6-tetrahydrofurfurylaminofluoran compound useful as a color former on an heat sensitive recording sheet | Hideyuki Sensui, Susumu Suzuka, Michihiro Gonda | 1987-02-10 |
| 4612558 | Fluoran compounds | Mitsutoshi Anzai, Masahiko Yamaguchi, Kazuyuki Wakasugi, Susumu Suzuka, Michihiro Gonda +2 more | 1986-09-16 |
| 4597795 | 6-tetrahydrofurfurylaminofluoran compound useful as a color former | Hideyuki Sensui, Susumu Suzuka, Michihiro Gonda | 1986-07-01 |