Patents by Inventor Sigeyuki Koga

Sigeyuki Koga 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).

  • Speaker system
    Patent number: 4146111
    Abstract: A speaker system comprising a speaker cabinet having a forward baffle plate, two side plates and a rear plate, a passive diaphragm, a speaker mounted in the baffle plate of the speaker cabinet, an opening disposed in the baffle plate next to the speaker as an outlet for the sound radiated from the passive diaphragm, a dividing plate slantedly disposed between the baffle plate and the rear plate of the speaker cabinet, the dividing plate dividing the speaker cabinet into a first part including the speaker and a second part including the opening, the passive diaphragm being mounted in the dividing plate.
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: March 27, 1979
    Assignee: Trio Kabushiki Kaisha
    Inventors: Yutaka Mae, Shiro Iwakura, Sigeyuki Koga, Hideki Ogawa, Hideaki Kanda
  • Oval dome type speaker
    Patent number: 3935400
    Abstract: A speaker assembly comprising a dome shaped diaphragm, the cross section along the plane containing the base of the diaphragm having an oval contour; a voice coil connected to the diaphragm; magnetic means operatively associated with the voice coil; and support means for supporting the diaphragm, voice coil and magnetic means.
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: January 27, 1976
    Assignee: Trio Kabushiki Kaisha
    Inventor: Sigeyuki Koga