Patents by Inventor Hiromi Kajikawa

Hiromi Kajikawa 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 manufacturing a valve sleeve
    Patent number: 4535519
    Abstract: A method of manufacturing a valve sleeve which is combined with a valve rotor to form a hydraulic rotary valve comprises a first step of expanding one end of a cylindrical member, a second step of forming a plurality of axial grooves in the internal surface of the cylindrical member while leaving its opposite ends intact, and a third step of restoring the expanded portion to its original diameter which it assumes before the expanding step.
    Type: Grant
    Filed: April 2, 1984
    Date of Patent: August 20, 1985
    Assignee: Jidosha Kiki Co., Ltd.
    Inventors: Hiromi Kajikawa, Masao Sugita