Patents by Inventor Shiki Koizumi

Shiki Koizumi 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).

  • Speaker
    Patent number: D524798
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: July 11, 2006
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi
  • Headphone
    Patent number: D525235
    Type: Grant
    Filed: July 12, 2005
    Date of Patent: July 18, 2006
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi
  • Combined charger and transmitter for headphone
    Patent number: D532366
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: November 21, 2006
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi
  • Earphone
    Patent number: D533867
    Type: Grant
    Filed: July 21, 2005
    Date of Patent: December 19, 2006
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi
  • Earphone
    Patent number: D533868
    Type: Grant
    Filed: July 21, 2005
    Date of Patent: December 19, 2006
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi
  • Audio player
    Patent number: D546838
    Type: Grant
    Filed: March 9, 2006
    Date of Patent: July 17, 2007
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi
  • Audio player
    Patent number: D550703
    Type: Grant
    Filed: March 9, 2006
    Date of Patent: September 11, 2007
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi
  • Audio player
    Patent number: D552124
    Type: Grant
    Filed: March 9, 2006
    Date of Patent: October 2, 2007
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi
  • Speaker box
    Patent number: D571355
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: June 17, 2008
    Assignee: Sony Corporation
    Inventor: Shiki Koizumi