Patents by Inventor Hiroko Yamasaki

Hiroko Yamasaki 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).

  • Method of making a speaker edge containing isocyanate and polyol
    Patent number: 6543574
    Abstract: It is an object of the present invention to provide a speaker edge which is high in strength, less in scattering of f0, high in waterproofness, small in amplitude at the time of resonance, easy to mold, and easy to be integrated with a cone body. That is, the present invention provides a speaker edge constituted by a molding which is molded in a manner so that a speaker edge raw material composition containing isocyanate and polyol is injected into a cavity of a mold by an agitating/mixing apparatus and subjected to reaction, foaming and curing in the cavity.
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: April 8, 2003
    Assignees: Inoac Corporation, Matsushita Electric Industrial Co., Ltd.
    Inventors: Sinya Mizone, Shinya Kaneko, Kiyosi Ikeda, Hiroko Yamasaki