Patents by Inventor Yin-Wah Chung

Yin-Wah Chung 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).

  • Superhard composite materials including compounds of carbon and nitrogen deposited on metal and metal nitride carbide and carbonitride
    Patent number: 5725913
    Abstract: A composite material having high hardness comprises a carbon nitrogen compound, such as CN.sub.x where x is greater than 0.1 and up to 1.33, deposited on a metal or metal compound selected to promote deposition of substantially crystalline CN.sub.x. The carbon nitrogen compound is deposited on a crystal plane of the metal or metal compound sufficiently lattice-matched with a crystal plane of the carbon nitrogen compound that the carbon nitrogen compound is substantially crystalline. A plurality of layers of the compounds can be formed in alternating sequence to provide a multi-layered, superlattice coating having a coating hardness in the range of 45-55 GPa, which corresponds to the hardness of a BN coating and approaches that of a diamond coating.
    Type: Grant
    Filed: October 23, 1996
    Date of Patent: March 10, 1998
    Assignee: Northwestern University
    Inventors: Ming-Show Wong, Dong Li, Yin-Wah Chung, William D. Sproul, Xi Chu, Scott A. Barnett