Patents by Inventor Zewu Dai

Zewu Dai 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).

  • MP3 player
    Patent number: D543554
    Type: Grant
    Filed: May 8, 2006
    Date of Patent: May 29, 2007
    Inventor: Zewu Dai
  • MP3 player
    Patent number: D555170
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: November 13, 2007
    Assignee: Shenzhen Hongtiantai Industry Co., Ltd.
    Inventor: Zewu Dai
  • MP3 player
    Patent number: D555171
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: November 13, 2007
    Assignee: Shenzhen Hongtiantai Industry Co., Ltd.
    Inventor: Zewu Dai
  • MP3 player
    Patent number: D563434
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: March 4, 2008
    Assignee: Shenzhen Hongtiantai Industry Co., Ltd.
    Inventor: Zewu Dai
  • MP3 player
    Patent number: D574014
    Type: Grant
    Filed: February 16, 2007
    Date of Patent: July 29, 2008
    Assignee: Shenzhen Hongtiantai Enterprise Co., Ltd.
    Inventor: Zewu Dai
  • Portable spare battery jacket for phone
    Patent number: D601960
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: October 13, 2009
    Assignee: Bestway (Hong Kong) Electronics Co., Limited
    Inventor: Zewu Dai