Patents by Inventor Ping H. Lu

Ping H. Lu 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).

  • Novolak resin mixtures
    Patent number: 5371169
    Abstract: The present invention provides mixture of at least two novolak resins with a molecular weight distribution overlap of at least 50% and having dissolution rates which differ by a factor of at least 2.0. A method is also provided for producing such novolak resin mixtures.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: December 6, 1994
    Assignee: Hoechst Celanese Corporation
    Inventors: Ping H. Lu, Anthony Canize, Dinesh N. Khanna, M. Dalil Rahman