Patents by Inventor James D. Stepp

James D. 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).

  • Solvent stable copper phthalocyanine blue pigments
    Patent number: 4289698
    Abstract: A process for producing stable copper phthalocyanine blue pigment in the alpha form. Copper phthalocyanine blue crystals are ground to produce a powder. The powder is contacted with chlorine and mixed with sulfuric acid. The pigment-sulfuric acid mixture is then mixed with water.
    Type: Grant
    Filed: January 3, 1980
    Date of Patent: September 15, 1981
    Assignee: BASF Wyandotte Corporation
    Inventor: James D. Stepp