Patents by Inventor Barbara N. Berg

Barbara N. Berg 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).

  • Preparation of heat stable pigment violet 23
    Patent number: 6476222
    Abstract: A process for improving the heat stability of Pigment Violet 23 by conditioning crude Pigment Violet 23 in the presence of about 1 to 10 wt. % of Pigment Violet 23 by-products (1), (2) and (3).
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: November 5, 2002
    Assignee: Sun Chemical Corporation
    Inventors: Norman W. Smith, Terrence R. Chamberlain, Barbara N. Berg, George McLaren, Russell J. Schwartz
  • Preparation of heat stable pigment violet 23
    Publication number: 20020091257
    Abstract: A process for improving the heat stability of Pigment Violet 23 by conditioning crude Pigment Violet 23 in the presence of about 1 to 10 wt. % of Pigment Violet 23 by-products (1), (2) and (3).
    Type: Application
    Filed: January 5, 2001
    Publication date: July 11, 2002
    Inventors: Norman W. Smith, Terrence R. Chamberlain, Barbara N. Berg, George McLaren, Russell J. Schwartz