Patents by Inventor Hirohumi Okuyama

Hirohumi Okuyama 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).

  • Patent number: 4352877
    Abstract: An electrophotographic process is provided wherein an electrostatic latent image is developed with finely divided toner particles and then the developed image is fixed by irradiating it with high energy ultraviolet rays or visible light. The toner particles used consist essentially of, based on the weight of the toner particles, (a) 62-99.4 wt. % of a binder resin substantially consisting of a bisphenol A/eplchlorohydrin type epoxy resin having a melting point of 60.degree.-160.degree. C., an epoxy equivalent of about 450-5,500 and a Mw of about 900-8,250, (b) 0.6-8 wt. % of carbon, (c) 0-5 wt. % of a dye and, optionally, (d) 0-20 wt. % of a montanic acid ester wax.
    Type: Grant
    Filed: April 21, 1981
    Date of Patent: October 5, 1982
    Assignee: Fujitsu Limited
    Inventors: Toshiaki Narusawa, Seiji Okada, Kiyohide Muramatsu, Teruo Yagishita, Hirohumi Okuyama