Patents by Inventor Hirobumi Iemura

Hirobumi Iemura 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).

  • Low temperature electrophotographic toner composition comprising nonlinear polyester resin
    Patent number: 4863825
    Abstract: A toner composition for electrophotography excellent in fixing property at a low temperature, offset resistance and blocking resistance comprising a resin binder and a colorant which is dispersed in the resin binder, the resin binder being a nonlinear polyester resin prepared by the reaction of:(a) an acid component comprising at least one long chain dicarboxylic acid selected from the group consisting of a linear aliphatic dicarboxylic acid having 16 to 34 carbon atoms, a dimer acid and a dibasic acid having 21 carbon atoms, an aromatic dicarboxylic acid, and optionally a monocarboxylic acid,(b) an alcohol component comprising an etherificated diphenol and optionally a glycidyl ester of rosin and(c) a crosslinking component comprising a polycarboxylic acid having valency of not less than 3 and/or a polyhydric alcohol having a valency of not less than 3, wherein in case that the long chain dicarboxylic acid and the aliphatic dicarboxylic acid are employed, the contents of the long chain dicarboxylic acid and
    Type: Grant
    Filed: November 9, 1987
    Date of Patent: September 5, 1989
    Assignees: Toyo Ink Manufacturing Co., Ltd., Arakawa Kagaku Kogyo Kabushiki Kaisha
    Inventors: Nobuyuki Yoshimoto, Hirobumi Iemura, Osamu Oseto, Nobuo Yamada