Patents by Inventor Susumu Umezawa

Susumu Umezawa 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).

  • Bottom valve apparatus of hydraulic shock absorber
    Patent number: 7048099
    Abstract: In a bottom valve apparatus of a hydraulic shock absorber in which a flow passage is formed in a bottom piece, and a check valve opening and closing the flow passage and a spring urging the check valve are fixed to one face side of the bottom piece by a fixing member, such as a nut, the check valve and the spring are subassembled in the fixing member, such as the nut.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: May 23, 2006
    Assignee: Showa Corporation
    Inventor: Susumu Umezawa
  • Bottom valve apparatus of hydraulic shock absorber
    Publication number: 20040129516
    Abstract: In a bottom valve apparatus of a hydraulic shock absorber in which a flow passage is formed in a bottom piece, and a check valve opening and closing the flow passage and a spring urging the check valve are fixed to one face side of the bottom piece by a fixing member, such as a nut, the check valve and the spring are subassembled in the fixing member, such as the nut.
    Type: Application
    Filed: August 7, 2003
    Publication date: July 8, 2004
    Inventor: Susumu Umezawa