Patents by Inventor Chuan-Ho Hwang

Chuan-Ho Hwang 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).

  • Patent number: 5435949
    Abstract: An artificial scenic rock made using a die-casting process and from a water-curable material such as cement or gypsum, water, and a polymer-based foaming agent. The artificial scenic rock is made first by spraying a color primer on the inner surface of a die casting mould. Then a filler, which was prepared by first mixing about 0.1 to 1 part of the polymer-based foaming agent with about 30 to 60 parts of water in an agitator then adding about 100 parts of the water curable water material while under agitation, is poured into the die casting mould. After hardened and released from the die casting mould, the final product has a natural rock-like color with appropriate texture and features similar to those of a real rock. The polymer-based foaming agent allows the artificial scenic rock of the present invention to be a solid and thus assumes better resemblance of a real rock, but with substantially reduced weight.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: July 25, 1995
    Inventor: Chuan-Ho Hwang