Patents by Inventor James Dial Stepp

James Dial Stepp 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).

  • Method of conditioning phthalocyanine pigments and product thereof
    Patent number: 3963743
    Abstract: A strong, clean phthalocyanine pigment is prepared by conditioning the crude pigment with 4-sulfophthalic acid or the anhydride thereof.
    Type: Grant
    Filed: October 1, 1973
    Date of Patent: June 15, 1976
    Assignee: Chemetron Corporation
    Inventor: James Dial Stepp