Patents by Inventor Akihiro Rokugawa

Akihiro Rokugawa 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).

  • Hydraulic master cylinder for vehicle
    Patent number: 6964166
    Abstract: A hydraulic master cylinder for vehicle has: a cylinder main body; a sleeve; a plurality of seal rings; a plug, a lid member comprising the sleeve and the plug; and a piston inserted into the cylinder bore so as to form a hydraulic pressure chamber between the piston and the lid member; wherein the sleeve is inserted into the cylinder main body with an open end thereof being made to face an interior of the cylinder main body so as to dispose the seal rings between a circumferential wall of the cylinder bore and the sleeve and in such a manner that the seal rings hold the outlet port therebetween, and the plug is fixedly threaded in the opening at the one end so as to prevent the dislocation of the sleeve.
    Type: Grant
    Filed: January 6, 2004
    Date of Patent: November 15, 2005
    Assignee: Nissin Kogyo Co., Ltd.
    Inventors: Hidemitsu Sunohara, Akihiro Rokugawa
  • Hydraulic master cylinder for vehicle
    Publication number: 20040194462
    Abstract: A hydraulic master cylinder for vehicle has: a cylinder main body; a sleeve; a plurality of seal rings; a plug, a lid member comprising the sleeve and the plug; and a piston inserted into the cylinder bore so as to form a hydraulic pressure chamber between the piston and the lid member; wherein the sleeve is inserted into the cylinder main body with an open end thereof being made to face an interior of the cylinder main body so as to dispose the seal rings between a circumferential wall of the cylinder bore and the sleeve and in such a manner that the seal rings hold the outlet port therebetween, and the plug is fixedly threaded in the opening at the one end so as to prevent the dislocation of the sleeve.
    Type: Application
    Filed: January 6, 2004
    Publication date: October 7, 2004
    Inventors: Hidemitsu Sunohara, Akihiro Rokugawa