Patents by Inventor Seimei Nishikawa

Seimei Nishikawa 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 block
    Patent number: 10626891
    Abstract: A hydraulic block includes multiple pairs of actuator ports connectable to a hydraulic actuator and a discharge oil passage for discharging work oil returned from the hydraulic actuator to the outside. The charge oil passage includes a first oil passage corresponding to a predetermined actuator port of all the actuator ports and a second oil passage corresponding to non-predetermined actuator ports other than the predetermined actuator ports. The first oil passage is disposed in parallel with the second oil passage.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: April 21, 2020
    Assignee: Kubota Corporation
    Inventors: Seimei Nishikawa, Juzo Okamoto, Yoshiro Takao, Sosuke Miyauchi, Eiji Miyazaki
  • Control valve and work vehicle having the control valve
    Patent number: 10184498
    Abstract: An inner oil passage (45) is formed inside a slidable spool (22). The slidable spool (22) defines, in its circumferential face, a first opening (46), a second opening (47) and a third opening (48). The first opening (46), the second opening (47) and the third opening (48) are communicated to the inner oil passage (45). When the slidable spool (22) is switched to a floating position (F), the first the first opening (46) is aligned with a first port end portion (25a), the second opening (47) is aligned with a second port end portion (26a), and the third opening (48) is aligned with a fourth port end portion (24a), respectively, and a first cylinder port and a second cylinder port are communicated to a tank port (24) via the inner oil passage (45).
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: January 22, 2019
    Assignee: Kubota Corporation
    Inventors: Haruka Kitahara, Seimei Nishikawa
  • Control Valve and Work Vehicle Having the Control Valve
    Publication number: 20180135659
    Abstract: An inner oil passage (45) is formed inside a slidable spool (22). The slidable spool (22) defines, in its circumferential face, a first opening (46), a second opening (47) and a third opening (48). The first opening (46), the second opening (47) and the third opening (48) are communicated to the inner oil passage (45). When the slidable spool (22) is switched to a floating position (F), the first the first opening (46) is aligned with a first port end portion (25a), the second opening (47) is aligned with a second port end portion (26a), and the third opening (48) is aligned with a fourth port end portion (24a), respectively, and a first cylinder port and a second cylinder port are communicated to a tank port (24) via the inner oil passage (45).
    Type: Application
    Filed: May 22, 2017
    Publication date: May 17, 2018
    Inventors: Haruka Kitahara, Seimei Nishikawa
  • Hydraulic Block
    Publication number: 20170234336
    Abstract: A hydraulic block includes multiple pairs of actuator ports connectable to a hydraulic actuator and a discharge oil passage for discharging work oil returned from the hydraulic actuator to the outside. The charge oil passage includes a first oil passage corresponding to a predetermined actuator port of all the actuator ports and a second oil passage corresponding to non-predetermined actuator ports other than the predetermined actuator ports. The first oil passage is disposed in parallel with the second oil passage.
    Type: Application
    Filed: December 14, 2016
    Publication date: August 17, 2017
    Inventors: Seimei Nishikawa, Juzo Okamoto, Yoshiro Takao, Sosuke Miyauchi, Eiji Miyazaki