Patents by Inventor Takashi Isaka

Takashi Isaka 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
    Patent number: 6134337
    Abstract: In a loudspeaker, a diaphragm is equally divided circumferentially into a plurality of regions which have the same shape with each other. Each of the divided regions is formed by a hyperbolic paraboloid. The hyperbolic paraboloid is obtained by moving a straight line connecting between two segments along these two segments. The hyperbolic paraboloid is large in strength and can suppress generation of the dividing vibration of the diaphragm.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: October 17, 2000
    Assignees: Bell Tech Co., Ltd., Foster Electric Co., Ltd.
    Inventor: Takashi Isaka