Patents by Inventor Tsuneo Nishijima

Tsuneo Nishijima 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).

  • Vacuum cleaner
    Patent number: 4463473
    Abstract: The present invention relates to a vacuum cleaner in which an alarm sound is generated by introducing air from the exterior in bypassing relation to a filter 8 when a suction load imposed on a fan motor 3 exceeds a predetermined value. The alarm sound can be emitted or stopped without adversely affecting the introduction of bypassing air toward the fan motor 3. With such an arrangement, the vacuum cleaner can be used conveniently, and the fan motor 3 is prevented from being burned out.
    Type: Grant
    Filed: December 23, 1981
    Date of Patent: August 7, 1984
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Seiichi Nakada, Hiromi Yoshikawa, Hiroshi Ohno, Tsuneo Nishijima, Hiroshi Kawakami
  • Upright vacuum cleaner
    Patent number: 4446595
    Abstract: An upright vacuum cleaner includes a rotary brush 12 disposed at a suction port in a floor nozzle 4 and capable of being rotated or stopped by shifting a motor-driven belt toward a drive pulley 17 or an idle pulley 18. The upright vacuum cleaner can conveniently be used for cleaning flat noncarpeted floors as well as carpeted floors.
    Type: Grant
    Filed: December 2, 1981
    Date of Patent: May 8, 1984
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Seiichi Nakada, Hiroshi Ohno, Tsuneo Nishijima, Hiroshi Kawakami