Patents by Inventor Charles C. Y. Chen

Charles C. Y. Chen 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).

  • Process of purification of amidoxime containing cleaning solutions and their use
    Patent number: 7838483
    Abstract: The invention relates to processes for producing and using amidoxime compounds with low trace metal impurities. The invention further relates to compositions comprising amidoxime compounds with low trace metal impurities, such compositions useful for cleaning or removing residues from semiconductor substrates and/or equipment.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: November 23, 2010
    Assignee: EKC Technology, Inc.
    Inventors: Wai Mun Lee, Charles C. Y. Chen