Patents by Inventor Da H. Peng

Da H. Peng 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).

  • Method for producing a tungsten carbide tip punch
    Patent number: 4722125
    Abstract: A method for producing a tungsten carbide tip punch includes:(1) preparing a punch rod including a top surface having a cylindrical protrusion;(2) placing on the top surface of the punch rod a tungsten carbide piece having a hardness greater than that of the punch rod and including a bottom surface having a crown-like indentation which opens at the bottom surface and which is capable of being well matched with said cylindrical protrusion at the lowermost portion of the crown-like indentation.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: February 2, 1988
    Inventor: Da H. Peng