Patents by Inventor Kwong Chit Tsang

Kwong Chit Tsang 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: D518029
    Type: Grant
    Filed: September 15, 2004
    Date of Patent: March 28, 2006
    Assignee: Beans Electronics Ltd.
    Inventor: Kwong Chit Tsang
  • Speaker volume control
    Patent number: D524291
    Type: Grant
    Filed: September 15, 2004
    Date of Patent: July 4, 2006
    Assignee: Beans Electronics Ltd.
    Inventor: Kwong Chit Tsang
  • Speaker
    Patent number: D549220
    Type: Grant
    Filed: June 6, 2006
    Date of Patent: August 21, 2007
    Assignee: Inno-Tech Design Consultant Ltd.
    Inventor: Kwong Chit Tsang