Patents by Inventor Hitoshi Yoshikawa

Hitoshi Yoshikawa 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).

  • Publication number: 20020039955
    Abstract: A roller for office automation equipment which does not suffer from impairment of a cross-linking reaction or occurrence of a delay therein, is excellent in permanent set resistance and low-temperature bleedability, and permits achievement of a low hardness.
    Type: Application
    Filed: August 2, 2001
    Publication date: April 4, 2002
    Applicant: Tokai Rubber Industries, Ltd.
    Inventors: Kazuhiro Takeda, Sumio Oinuma, Naoki Yamaguchi, Hiroshige Hiramatsu, Hitoshi Yoshikawa
  • Patent number: 6146320
    Abstract: A conductive roll available at low cost and superior both in moldability and compression set and having small dispersion or fluctuation in electrical resistance includes a shaft and a base rubber layer formed on a peripheral surface of the shaft, the base rubber layer formed of a composition containing the following components (A) to (C): (A) a liquid polymer having a structural unit (.alpha.) derived from at least one of butadiene and isoprene and having an alkenyl group in a side chain thereof; (B) a hydrosilylation crosslinking agent; and (C) a hydrosilylation catalyst. In the conductive roll the alkenyl group of the structural unit (.alpha.
    Type: Grant
    Filed: July 28, 1999
    Date of Patent: November 14, 2000
    Assignee: Tokai Rubber Industries, Ltd.
    Inventors: Hitoshi Yoshikawa, Shoji Arimura, Kunio Ito, Sumio Oinuma, Akihiko Kaji, Kenichi Ohkuwa, Kazuhiro Takeda, Satoshi Suzuki
  • Patent number: 6142922
    Abstract: A conductive roll to be used as a developing roll, a charging roll, a transfer roll or the like in an electrophotographic apparatus such as a copying machine, a printer or a facsimile, of the present invention comprises a base rubber layer formed on a peripheral surface of a shaft, an intermediate layer formed on a peripheral surface of the base rubber layer, and a surface layer formed on a peripheral surface of the intermediate layer, the surface layer being composed of a resin composition comprising:(A) a silicone-grafted acrylic polymer which comprises repeating units represented by the following general formula (1), wherein an acrylic polymer portion of the silicone-grafted acrylic polymer exclusive of a structural portion derived from a siloxane has a glass-transition temperature of -35 to 30.degree. C.:--(Y).sub.k -- --(Z).sub.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: November 7, 2000
    Assignee: Tokai Rubber Industries, Ltd.
    Inventors: Hitoshi Yoshikawa, Shoji Arimura, Akihiko Kaji, Kenichi Ohkuwa
  • Patent number: 5993366
    Abstract: A low hardness conductive roll, wherein an innermost layer is formed on the peripheral surface of a shaft body, an intermediate layer is formed on the peripheral surface thereof, and further an outermost layer is formed on the peripheral surface thereof, and wherein the outermost layer is formed of a resin composition comprising the following Component (A) so that good toner electrification property and toner releasability are achieved: ##STR1## wherein Y denotes a linear structural portion derived from an acrylic monomer, Z denotes a structural portion derived from an acrylic monomer and also has a structural portion derived from siloxane, and k and n denote positive numbers of 1 to 3,000, respectively.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: November 30, 1999
    Assignee: Tokai Rubber Industries, Ltd.
    Inventors: Akihiko Kaji, Kenichi Ohkuwa, Hitoshi Yoshikawa, Shoji Arimura
  • Patent number: 5934783
    Abstract: A ventilating fan/light combination is provided comprising a fan and a boxlike ventilating fan housing which incorporates the fan and has an opening formed at its lower portion. The ventilating fan housing includes an exhaust port for connection with a duct, and is provided so as to project into a ceiling. The ventilating fan/light combination also includes an illuminating lamp, a lighting unit casing which incorporates the illuminating lamp and is provided at the lower portion of the ventilating fan housing so as to define an air passage in the opening, and a decorative frame which includes a light shielding portion surrounding an outer periphery of the lighting unit casing and has a vent hole communicating with the air passage.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: August 10, 1999
    Assignee: Matsushita Seiko Co., Ltd.
    Inventor: Hitoshi Yoshikawa
  • Patent number: 5299955
    Abstract: In a portable electrical device, a plurality of engaging portions of a frame on surfaces of the frame are directed in the same direction and engaging portions on two connecting terminals can be brought into engagement with the engaging portions along the same direction. Thus, both of the connecting terminals can be mounted on the frame from the same direction, and the efficiency of the mounting operation is improved and can be automated. Furthermore, deformation of or damage to the connecting terminals, caused by the mounting process, is reduced.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: April 5, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hajime Maeda, Toru Tachikawa, Hitoshi Yoshikawa