Patents by Inventor Hisayasu Hasegawa

Hisayasu Hasegawa 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 valve sleeves
    Patent number: 4689864
    Abstract: A method of making valve sleeves used for controlling the flow of hydraulic fluid in devices, such as power steering units in motorized vehicle, and the product of the utilized method. The method utilizes a grooving male die which forms a groove on an interior surface of a valve sleeve.
    Type: Grant
    Filed: March 28, 1986
    Date of Patent: September 1, 1987
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Nobuo Fukuma, Hisayasu Hasegawa, Kimimasa Murayama, Kunio Hayashi, Yoshihiro Tokudome