Patents by Inventor David Y. Yuen

David Y. Yuen 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).

  • Shower drain hair-trap
    Patent number: D308720
    Type: Grant
    Filed: July 23, 1986
    Date of Patent: June 19, 1990
    Inventor: David Y. Yuen
  • Shower drain hair-trap
    Patent number: D316594
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: April 30, 1991
    Inventor: David Y. Yuen