Patents by Inventor Yuji Katayama

Yuji Katayama 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).

  • Pilot-operated dual check valve assembly with cross-line flow valving pilot pistons
    Patent number: 5036750
    Abstract: A double operate check valve used in a hydraulic pressure circuit for locking and unlocking a vibration absorbing hydraulic cylinder included in a wheel suspension mechanism of a vehicle, which includes an improvement in its structure for providing the suspension with improved compliance with respect to road surface undulation and corresponding comfortable drive of the vehicle. The check valve pilot pistons have fluid conducting surfaces which are connected by a valve body passageway and which communicate the main fluid paths when hydraulic pressure in the pilot chamber urges the pilot pistons to open the check valves.
    Type: Grant
    Filed: June 7, 1990
    Date of Patent: August 6, 1991
    Assignee: Nippon Air Brake Kabushiki Kaisha
    Inventor: Yuji Katayama
  • Digital audio player
    Patent number: D438525
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: March 6, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuji Katayama
  • Digital audio player
    Patent number: D438526
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: March 6, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuji Katayama
  • Digital audio player
    Patent number: D439574
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: March 27, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuji Katayama
  • Digital audio player
    Patent number: D441735
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: May 8, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuji Katayama
  • Digital still camera
    Patent number: D467602
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: December 24, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuji Katayama
  • Digital still camera
    Patent number: D473250
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: April 15, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuji Katayama
  • Digital still camera
    Patent number: D473579
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: April 22, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuji Katayama, Keita Tanaka
  • Video tape recorder
    Patent number: D323163
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: January 14, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuji Katayama
  • Combined television receiver and video tape recorder
    Patent number: D324044
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: February 18, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuji Katayama
  • Video tape recorder
    Patent number: D344703
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: March 1, 1994
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuji Katayama, Takashi Nakamura
  • Video tape recorder
    Patent number: D357247
    Type: Grant
    Filed: May 27, 1993
    Date of Patent: April 11, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toshiaki Takama, Yuji Katayama, Shunsaku Nagata