Patents by Inventor Bor-Jen Cheng

Bor-Jen Cheng 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 evaluation of metal impurity in lithographic materials
    Patent number: 6346418
    Abstract: A method for evaluating ratios of metallic impurities in lithographic materials is disclosed. The method comprises: separating said metal from said lithographic material by microwave heating; then adding said metal to an acid to form a solution; and finally analyzing said solution by a instrument to measure ratio of said metal.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: February 12, 2002
    Assignee: Mosel Vitelic Inc.
    Inventors: Hui-An Chang, Bor-Jen Cheng, Yu-Chuan Lin