Patents by Inventor Van Hong Tsai

Van Hong Tsai 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).

  • Retractable earphone device
    Patent number: D583362
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: December 23, 2008
    Assignee: Y. C. Cable East Inc.
    Inventors: Kai Cheng Hsu, Van Hong Tsai