Issued Patents All Time
Showing 26–43 of 43 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5118756 | Reaction system modifier suitable for use in the productions of microcapsules | Kiyoharu Hasegawa, Yukio Tamura, Yoshihiro Oono | 1992-06-02 |
| 5023366 | Salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal salts of the copolymers, and color-developing sheets employing the agents | Keizaburo Yamaguchi, Yoshimitsu Tanabe, Akihiro Yamaguchi | 1991-06-11 |
| 4997874 | Aqueous suspension and preparation method thereof | Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi, Keizaburo Yamaguchi, Yoshimitsu Tanabe +1 more | 1991-03-05 |
| 4931420 | Temperature history indicator and its manufacturing method | Haruki Tsutsumi, Eishi Tanaka, Yoshiro Fuseya, Kiyoharu Hasegawa, Hiroyuki Akahori | 1990-06-05 |
| 4783521 | Linear salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal-resins of the copolymers | Akihiro Yamaguchi, Keizaburo Yamaguchi, Yoshimitsu Tanabe, Masaru Wada | 1988-11-08 |
| 4760108 | Microcapsule-containing water-base coating formulation and copying and/or recording material making use of said coating formulation | Kiyoharu Hasegawa, Masatoshi Takagi, Takamine Yamaguchi | 1988-07-26 |
| 4735744 | Novel benzoquinone derivatives and production process thereof as well as use as color-developers suitable for recording materials | Michihiro Tsujimoto, Kiyoharu Hasegawa, Hiroyuki Akahori, Eishi Tanaka | 1988-04-05 |
| 4729671 | Temperature control indicator unit | Iwao Chiba, Masumi Iemura | 1988-03-08 |
| 4632987 | Process for the preparation of triarylmethane compounds | Michihiro Tsujimoto, Hiroyuki Akahori, Kiyoharu Hasegawa | 1986-12-30 |
| 4574110 | Process for producing microcapsules and microcapsule slurry | Kiyoharu Hasegawa, Yukio Tamura, Yoshihiro Oono | 1986-03-04 |
| 4561000 | Heat-sensitive recording unit | Michihiro Tsujimoto, Kiyoharu Hasegawa, Hiroyuki Akahori | 1985-12-24 |
| 4480002 | Dyestuff-containing microscopic capsule suspension for record materials | Kiyoharu Hasegawa, Hiroyuki Akahori, Michihiro Tsujimoto | 1984-10-30 |
| 4400492 | Color-developer for pressure-sensitive recording sheets | Saburo Kawashima, Yoshimitu Tanabe, Hisamichi Murakami | 1983-08-23 |
| 4398753 | Pressure sensitive recording unit | Kiyoharu Hasegawa, Hiroyuki Akahori, Michihiro Tsujimoto | 1983-08-16 |
| 4384871 | Dyestuff-containing microscopic capsule dispersion for record materials | Kiyoharu Hasegawa, Hiroyuki Akahori, Michihiro Tsujimoto | 1983-05-24 |
| 4379897 | Color-developer for pressure-sensitive sheets | Yoshimitu Tanabe, Hisamichi Murakami | 1983-04-12 |
| 4271059 | Color-developing composition for pressure-sensitive recording sheet material and process for the preparation thereof containing phenolic resin and hindered phenol | Saburo Kawashima, Kenichi Sugimoto, Tadashi Kobayashi | 1981-06-02 |
| 4235769 | Color-developing phenolic-aldehyde composition for pressure-sensitive recording sheet material and process for the preparation thereof | Saburo Kawashima, Kenichi Sugimoto, Tadashi Kobayashi | 1980-11-25 |