Patents by Inventor Shigeru Nagumo

Shigeru Nagumo 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 booster brake system
    Patent number: 6959639
    Abstract: A hydraulic booster brake system includes a flow priority valve connected to a discharge portion of a hydraulic pump. To the flow priority valve are connected a brake booster and a power steering booster in parallel. The flow priority valve supplies a stipulated flow quantity of a hydraulic fluid in a total flow quantity of the hydraulic fluid discharged by the hydraulic pump to the brake booster by priority. A relief valve is provided between a brake port and a drain port. A valve body of the relief valve can adjust a relief pressure by turning a screw shaft for relief pressure adjustment.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: November 1, 2005
    Assignee: Mitsubishi Fuso Truck And Bus Corporation
    Inventors: Shigeru Nagumo, Takashi Totsuka, Tomoki Hirabayashi
  • Hydraulic booster brake system
    Publication number: 20030193238
    Abstract: A hydraulic booster brake system includes a flow priority valve connected to a discharge portion of a hydraulic pump. To the flow priority valve are connected a brake booster and a power steering booster in parallel. The flow priority valve supplies a stipulated flow quantity of a hydraulic fluid in a total flow quantity of the hydraulic fluid discharged by the hydraulic pump to the brake booster by priority. A relief valve is provided between a brake port and a drain port. A valve body of the relief valve can adjust a relief pressure by turning a screw shaft for relief pressure adjustment.
    Type: Application
    Filed: April 11, 2003
    Publication date: October 16, 2003
    Inventors: Shigeru Nagumo, Takashi Totsuka, Tomoki Hirabayashi