Patents by Inventor Hisatsugu Nagano

Hisatsugu Nagano 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).

  • Developing roller of monocomponent developing system
    Patent number: 5244741
    Abstract: A developing roller of monocomponent developing system, in which a low hygroscopic material is used for a dielectric layer, thereby suppressing a change of electric properties of the layer caused by water absorption, that is, a dielectric layer using a low hygroscopic material, namely, a low hygroscopic elastomer or a low hygroscopic polymer is used at an outer surface of a conductive supporting body where, as a concrete example of the elstomer or the polymer, polyethylene, polypropylene, ethylenic copolymer, rigid polyvinyl chloride, fluoro resin, acetal resin or mixtures thereof, or the elastomer or the polymer in which manganese-aluminum magnet, strontium ferrite, barrium ferrite of mixtures thereof is dispersed.
    Type: Grant
    Filed: March 18, 1992
    Date of Patent: September 14, 1993
    Assignee: Ricoh Company, Ltd.
    Inventors: Hisatsugu Nagano, Takeo Araki, Fumio Okuya, Tsuyoshi Imamura, Kyoichi Ashikawa