Patents by Inventor Yasumitsu Wada

Yasumitsu Wada 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).

  • Mechanical two-way loudspeaker
    Patent number: 4477699
    Abstract: A mechanical two way loudspeaker includes a low frequency diaphragm arranged coaxially with one another which are driven by the same voice coil. In order to flatten the sound pressure versus frequency characteristic of the loud speaker in the high frequency range, the low frequency diaphragm is provided with a flat sound wave radiation surface. The flat surface may be of a honey-comb configuration, or may be made of a low density synthetic foam.
    Type: Grant
    Filed: March 10, 1982
    Date of Patent: October 16, 1984
    Assignee: Pioneer Electronic Corporation
    Inventors: Yasumitsu Wada, Isao Yamamuro