Patents by Inventor Masaharu Yoneyama

Masaharu Yoneyama 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).

  • Loudspeaker for higher audio frequencies and a manufacturing method thereof
    Patent number: 5719946
    Abstract: A loudspeaker has a first diaphragm having a domed shape, a second diaphragm formed on a periphery of the first diaphragm, and a voice coil provided at a juncture of the first and second diaphragms. The second diaphragm is designed such that a dip frequency by shape effect thereof is positioned at a frequency higher than a high limit frequency of the first diaphragm.
    Type: Grant
    Filed: August 2, 1995
    Date of Patent: February 17, 1998
    Assignee: Pioneer Electronic Corporation
    Inventors: Shouichiro Terauchi, Tomohiro Suenaga, Masaharu Yoneyama, Takanobu Saito