Patents by Inventor Hidehiko Koishi

Hidehiko Koishi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Heat-sensitive recording materials
    Patent number: 4672401
    Abstract: A heat-sensitive recording material contains, in its heat-sensitive, color-developing layer comprising a leuco dye and an organic acid that reacts with said leuco dye to develop color upon heating, a hydrocarbon compound melting at a temperature in the range from 50.degree. C. to 200.degree. C. and selected from benzylbiphenyls, alkyl-substituted benzylbiphenyls, hydrogenated benzylbiphenyls, hydrogenated alkyl-substituted benzylbiphenyls, hydrogenated terphenyls and hydrogenated alkyl-substituted terphenyls. With its quick thermal response, this material is suitable for high-speed recording.
    Type: Grant
    Filed: June 12, 1985
    Date of Patent: June 9, 1987
    Assignee: Nippon Steel Chemical Co., Ltd.
    Inventors: Yasuharu Yamada, Tadashi Komoto, Hidehiko Koishi