Patents by Inventor Laura L. Kierstein

Laura L. Kierstein 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).

  • Organic positive photoconductor
    Patent number: 5571650
    Abstract: A positive charging photoconductor of, preferably, 4 to 8 percent by weight metal-free phthalocyanine, 30-50 percent by weight tritolylamine and the remainder polyvinylbutyral.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: November 5, 1996
    Assignee: Lexmark International, Inc.
    Inventors: Garry D. Hinch, Laura L. Kierstein, Ronald H. Levin