Patents by Inventor Hong Cheng Chang

Hong Cheng Chang 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).

  • Toilet seat device having support for children
    Patent number: 6598240
    Abstract: A toilet seat device includes an annular base member rotatably attached onto a toilet bowl, and a board for safely and stably supporting children on the annular base member. The board is coupled to the annular base member and supportable on a horizontal working position to support the feet of the children. A plate is rotatably coupled between the annular base member and the board. The plate and the board may be received in the annular base member. A panel may be secured to the board at a perpendicular position, to support the board at the horizontal working position.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: July 29, 2003
    Inventors: Hong Cheng Chang, Tsung Fu Lin