Patents by Inventor Hui Hwa Chang

Hui Hwa 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).

  • Mold device for making safety shoe
    Patent number: 5736167
    Abstract: A mold device for making a safety shoe includes a last and a post secured on a board. The last includes a number of spacers and a number of cone-shaped supports formed on top for engaging with a protector and for spacing the protector from the last. Two mold pieces are pivotally coupled to the post and each includes a mold cavity for engaging with the last. A cover is pivotally coupled to the post. The spacers and the supports may space the protector from the last and the mold pieces and the cover for allowing the protector to be engaged in the safety shoe.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: April 7, 1998
    Inventor: Hui Hwa Chang