Patents by Inventor Masahiro Ookubo

Masahiro Ookubo 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 speed change stage control system
    Patent number: 5079973
    Abstract: A shift limiting valve (110) driven by a control solenoid valve controlled by an electronic control means (40) is installed between a manual shift valve (50) working in cooperation with speed-change operation of driver and shift valves (60) and (62) driven by solenoid valves (S1) and (S2) controlled by the electronic control means (40). The control solenoid valve is controlled by the electronic control means (40) to actuate the shift limiting valve (110) when a vehicle is moving forward at a specified or higher speed so that a planetary gear transmission (12) is not changed to a reverse drive stage even if the driver changes a drive mode to the reverse drive stage.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: January 14, 1992
    Assignee: Kabushiki Kaisha Daikin Seisakusho
    Inventors: Masahiro Ookubo, Hirofumi Shiba