Patents by Inventor Ching-Sun Wen

Ching-Sun Wen 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).

  • Automatic door assembly
    Patent number: 5170585
    Abstract: The automatic door assembly includes a rail, a door carriage movably provided on the rail, a driving unit for moving the door carriage, a rechargeable battery unit for supplying electric power to operate the driving unit and a circuit for electrically connecting the rechargeable battery unit and the driving unit. It also has a charging unit for timely charging of the rechargeable battery unit and a device for stopping the door carriage automatically at the open and closed positions.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: December 15, 1992
    Inventor: Ching-Sun Wen