Patents by Inventor Yuji Yabuki

Yuji Yabuki 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).

  • Solenoid valve
    Patent number: 6808160
    Abstract: According to the present invention, a cylindrical member of a solenoid valve is provided with a protruding portion that protrudes in an axial direction of the cylindrical member. By fitting the protruding portion into a vertical groove of a plunger, it is possible to restrict the cylindrical member from moving in a peripheral direction of the plunger. Therefore, it is possible to prevent change of the flow path that passes the plunger and the vertical groove, as well as to prevent variation in a sliding speed of the plunger or the like. As a result, a fluid pulsation reduction effect is obtained.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: October 26, 2004
    Assignee: Advics Co., Ltd.
    Inventors: Hideyuki Hayakawa, Yozo Majima, Yuji Yabuki, Noriyuki Hosoi
  • Solenoid valve
    Publication number: 20040026643
    Abstract: According to the present invention, a cylindrical member of a solenoid valve is provided with a protruding portion that protrudes in an axial direction of the cylindrical member. By fitting the protruding portion into a vertical groove of a plunger, it is possible to restrict the cylindrical member from moving in a peripheral direction of the plunger. Therefore, it is possible to prevent change of the flow path that passes the plunger and the vertical groove, as well as to prevent variation in a sliding speed of the plunger or the like. As a result, a fluid pulsation reduction effect is obtained.
    Type: Application
    Filed: May 30, 2003
    Publication date: February 12, 2004
    Inventors: Hideyuki Hayakawa, Yozo Majima, Yuji Yabuki, Noriyuki Hosoi
  • Electromagnetic valve and hydraulic circuit
    Patent number: 6364431
    Abstract: An electromagnetic valve has a plunger as an armature of an electromagnetic actuator and a ball as a movable valve member. The plunger and the ball are separated to permit the ball to move freely in response to a pressure difference between an inlet and an outlet when the coil attracts the plunger. If the plunger undesirably moves by a pressure difference between both ends of the plunger, the ball can keep a closing condition during a suction pressure that is higher than a pressure in the inlet. Therefore, an undesired communication between a master reservoir and a pump is avoided.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: April 2, 2002
    Assignee: Denso Corporation
    Inventors: Yuji Yabuki, Moriharu Sakai, Shinichi Tsujimura
  • Method of molding an acoustic diaphragm part of para aromatic polyamide
    Patent number: 5283027
    Abstract: An acoustic diaphragm is manufactured from a film of para-orientation aromatic polyamide through a molding process. In the molding process, the die for the molding process is heated to a predetermined temperature and then the molding press is conducted onto the film of para-orientation aromatic polyamide. The combination of the dies and film are cooled into about 80.degree. C. and then the clamping of dies is released to take the pressed film off.
    Type: Grant
    Filed: February 26, 1993
    Date of Patent: February 1, 1994
    Assignees: Kabushiki Kaisha Kenwood, Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Yoshio Sakamoto, Syuhei Ohta, Yuji Yabuki, Shigemitsu Muraoka