Patents by Inventor Yasuhiro Ishii

Yasuhiro Ishii 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).

  • Diaphragm for speaker
    Patent number: 4129195
    Abstract: A diaphragm for a dynamic cone speaker which is composed of a porous metal produced from a metal such as nickel, wherein a layer, such as of aluminum foil, is disposed on a surface of the porous metal to eliminate the gas permeability of the porous metal.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: December 12, 1978
    Assignees: Sanyo Electric Co., Ltd., Tokyo Sanyo Electric Co., Ltd.
    Inventors: Yasuhiro Ishii, Shintaro Hirose, Ryoichi Kawasaki
  • Diaphragm for speaker
    Patent number: 4128138
    Abstract: A diaphragm for a dynamic cone speaker which is composed of a porous metal produced from nickel powder wherein a vinyl chloride sheet is disposed on the surface of the porous metal to eliminate the gas permeability of the porous metal.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: December 5, 1978
    Assignees: Sanyo Electric Co., Ltd., Tokyo Sanyo Elctric Co., Ltd.
    Inventors: Yasuhiro Ishii, Shintaro Hirose, Ryoichi Kawasaki