Patents by Inventor Shigeya Yamakawa

Shigeya Yamakawa 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 and tool for hair treatment
    Patent number: 5743278
    Abstract: The invention concerns a hair treatment method using a hair treatment liquid having been electrolytically treated by passing current through hair. The hair treatment method features applying a hair treatment liquid to hair and electrolytically treating the applied hair treatment liquid by passing current through the hair. The invention also concerns a hair treatment tool which is substantially made of an insulating material and features that an anode electrode bar and a cathode electrode bar both connected to a power supply are disposed such as to be in contact with hair, the hair having been imparted with conductivity being pinched between the two electrode bars to pass current through the pinched hair.
    Type: Grant
    Filed: May 2, 1996
    Date of Patent: April 28, 1998
    Assignee: Shigeya Yamakawa
    Inventors: Hiroyuki Ookura, Shigeya Yamakawa