Patents by Inventor Keitaro Tsuboki

Keitaro Tsuboki 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).

  • Front portion of tape player
    Patent number: D436103
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: January 9, 2001
    Assignee: Sony Corporation
    Inventors: Yoshinori Yamada, Keitaro Tsuboki
  • Tape player
    Patent number: D438527
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: March 6, 2001
    Assignee: Sony Corporation
    Inventors: Yoshinori Yamada, Tetsu Kataoka, Keitaro Tsuboki
  • Cap for a writing instrument
    Patent number: D504465
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: April 26, 2005
    Assignee: Pentel Kabushiki Kaisha
    Inventors: Tomoaki Shibata, Keitaro Tsuboki
  • Ball point pen
    Patent number: D507811
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: July 26, 2005
    Assignee: Pentel Kabushiki Kaisha
    Inventors: Tomoaki Shibata, Keitaro Tsuboki
  • Tape player
    Patent number: D445103
    Type: Grant
    Filed: December 12, 2000
    Date of Patent: July 17, 2001
    Assignee: Sony Corporation
    Inventors: Yoshinori Yamada, Tetsu Kataoka, Keitaro Tsuboki
  • Audio player
    Patent number: D450713
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: November 20, 2001
    Assignee: Sony Corporation
    Inventors: Satoshi Masamitsu, Keitaro Tsuboki
  • Earphone
    Patent number: D457515
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: May 21, 2002
    Assignee: Sony Corporation
    Inventors: Satoshi Masamitsu, Keitaro Tsuboki
  • Electronic still camera
    Patent number: D459378
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: June 25, 2002
    Assignee: Sony Corporation
    Inventors: Satoshi Masamitsu, Keitaro Tsuboki
  • Audio disc player combined with radio receiver and tape recorder
    Patent number: D410925
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: June 15, 1999
    Assignee: Sony Corporation
    Inventors: Atsushi Kawase, Keitaro Tsuboki
  • Selecting device
    Patent number: D413593
    Type: Grant
    Filed: April 7, 1997
    Date of Patent: September 7, 1999
    Assignee: Sony Corporation
    Inventors: Satoshi Suzuki, Keitaro Tsuboki