Patents by Inventor Si-Kang Yen

Si-Kang Yen 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).

  • Safety door stopper
    Patent number: 6345849
    Abstract: A safety door stopper for use in trip, including a wedge stopper block and a coupler member. The coupler member is used to fix the wedge stopper block under a lower edge of the door board. A bottom face of the wedge stopper block is disposed with an unsmooth face. When the wedge stopper block is fixed under the lower edge of the door board, the unsmooth face is able to enlarge the frictional coefficient between the door board and the ground and enlarge the frictional force. Therefore, the resistance against the door board is increased to make it difficult to push open the door board and ensure safety in trip.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: February 12, 2002
    Inventor: Si-Kang Yen