Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4735744 | Novel benzoquinone derivatives and production process thereof as well as use as color-developers suitable for recording materials | Kiyoharu Hasegawa, Hiroyuki Akahori, Eishi Tanaka, Makoto Asano | 1988-04-05 |
| 4632987 | Process for the preparation of triarylmethane compounds | Hiroyuki Akahori, Kiyoharu Hasegawa, Makoto Asano | 1986-12-30 |
| 4561000 | Heat-sensitive recording unit | Makoto Asano, Kiyoharu Hasegawa, Hiroyuki Akahori | 1985-12-24 |
| 4480002 | Dyestuff-containing microscopic capsule suspension for record materials | Makoto Asano, Kiyoharu Hasegawa, Hiroyuki Akahori | 1984-10-30 |
| 4398753 | Pressure sensitive recording unit | Makoto Asano, Kiyoharu Hasegawa, Hiroyuki Akahori | 1983-08-16 |
| 4384871 | Dyestuff-containing microscopic capsule dispersion for record materials | Makoto Asano, Kiyoharu Hasegawa, Hiroyuki Akahori | 1983-05-24 |
| 4302396 | Chlorinated 4-methylphthalic anhydrides | Tsutomu Nishizawa, Kiyoharu Hasegawa, Nobuyoshi Abe | 1981-11-24 |