Patents by Inventor Gongzhen Cheng

Gongzhen 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).

  • Hydrophobic liquid photobleaches
    Patent number: 6645928
    Abstract: Nonionic, hydrophobic photobleach compounds, especially those based on Si(IV) phthalocyanines, which are liquid at ambient temperatures and their use in a variety of consumer product compositions.
    Type: Grant
    Filed: February 11, 2002
    Date of Patent: November 11, 2003
    Assignee: Case Western Reserve University
    Inventors: Malcolm Edward Kenney, Ying-Syi Li, Gongzhen Cheng, Rafael Ortiz, David Johnathan Kitko, Michael Eugene Burns
  • Methods for inserting silicon into phthalocyanines and naphthalocyanines
    Patent number: 5872248
    Abstract: A simple, flexible, convenient method for making silicon phthalocyanines and naphthalocyanines by inserting silicon into metal-free phthalocyanines and metal-free naphthalocyanines is provided. The method comprises: providing a metal-free phthalocyanine or metal-free naphthalocyanine; reacting the metal-free phthalocyanine or metal-free naphthalocyanine with HSiCl.sub.3 to provide a reaction product; then reacting the reaction product with water; and extracting a silicon phthalocyanine or a silicon naphthalocyanine. The invention also relates to novel phthalocyanines and naphthalocyanines. The phthalocyanines and naphthalocyanines are useful as photosensitizers and as dyes.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: February 16, 1999
    Assignee: Case Western Reserve University
    Inventors: Gongzhen Cheng, Guolun Hao, Hongqiao Wu, Ying-Syi Li, Malcolm E. Kenney