Patents by Inventor Kiyotaka Yamaguchi

Kiyotaka Yamaguchi 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).

  • Magnetic head device with a cleaning mechanism
    Patent number: 5469318
    Abstract: A magnetic head device with a cleaning mechanism includes: a head mounting stand including a head setting space in which a magnetic head is set, and tape guides for regulating the running of a magnetic tape, a lever which is swingably supported by a shaft on the upper surface of the rear end portion of the head mounting stand, a cleaning member embedded in the inner surface of the front end portion of the lever which is bent, and a drive member engaged with the rear end portion of the lever to swing the lever, the cleaning member being slidably moved on the front surface of the magnetic head. In the device, the shaft and the head mounting stand are formed as one unit.
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: November 21, 1995
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Naoto Inoue, Kiyotaka Yamaguchi
  • Method of making decolorizable toner
    Patent number: 5449583
    Abstract: A decolorizable toner including a resin binder, a near infrared ray-absorbing dye, a decolorizing agent and a light fastness stabilizer, and a process for preparing the decolorizable toner, which includes the steps of mixing the near infrared ray-absorbing dye and the light fastness stabilizer with the resin binder, and then mixing the decolorizing agent therewith. The decolorizable toner has excellent light stability during its production or storage and excellent decolorizing property.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: September 12, 1995
    Assignees: Showa Denko, K.K., Bando Chemical Industries, Ltd.
    Inventors: Katsumi Murofushi, Yoshikazu Hosoda, Yuki Abe, Kiyotaka Yamaguchi, Takayuki Yoshida
  • Decolorizable toner
    Patent number: 5362592
    Abstract: A decolorizable toner including a resin binder, a near infrared ray-absorbing dye, a decolorizing agent and a light fastness stabilizer, and a process for preparing the decolorizable toner, which includes the steps of mixing the near infrared ray-absorbing dye and the light fastness stabilizer with the resin binder, and then mixing the decolorizing agent therewith. The decolorizable toner has excellent light stability during its production or storage and excellent decolorizing property.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: November 8, 1994
    Assignees: Showa Denko K.K., Bando Chemical Industries, Ltd.
    Inventors: Katsumi Murofushi, Yoshikazu Hosoda, Toshio Kaji, Yuki Abe, Kiyotaka Yamaguchi, Takayuki Yoshida, Jiro Yamashiro, Toshio Arai, Takayuki Nagase, Harushi Nagami
  • Multi-position electrical switch
    Patent number: 4975547
    Abstract: The multi-position electrical switch includes a printed circuit (PC) board arranged in a casing and supporting an array of stationary contacts encircling a light emitting element fixed on the PC board. A resilient rubber sheet covers the PC board and supports an array of movable contacts arranged opposite the stationary contacts. A control knob having a central opening rests on the rubber sheet in the region of the movable contacts. The bottom of the knob is formed with a tubular projection communicating with the central opening of the knob and extending to the level of an opening in the rubber sheet around the light emitting element.
    Type: Grant
    Filed: June 2, 1989
    Date of Patent: December 4, 1990
    Assignees: Murakami Kameido Co., Ltd., Omron Tateishi Electronics, Co.
    Inventors: Kiyoshi Nakayama, Toshio Yoshioka, Kiyotaka Yamaguchi