Patents by Inventor Calvin C. Wanser

Calvin C. Wanser 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).

  • Copper phthalocyanine pigment systems
    Patent number: 4726847
    Abstract: Copper phthalocyanine pigment systems with improved rheological and optical performance characteristics comprising copper phthalocyanine or halogen-substituted copper phthalocyanines blended with sulfonated copper phthalocyanine and provided with an anionic-cationic surfactant coating, and a process for the preparation thereof.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: February 23, 1988
    Assignee: Ciba-Geigy Corporation
    Inventor: Calvin C. Wanser
  • Pigmentation of crude metal phthalocyanines
    Patent number: 3951678
    Abstract: A process for the conversion of crude metal phthalocyanines produced by fusion syntheses into pigments having improved tinctorial strength and transparency is described. The process involves mixing the dry crude metal phthalocyanine with 2 to 5 parts of 82 to 86% sulfuric acid per part of pigment in the crude in the absence of shear to form a paste-like mass and then hydrolyzing the mass under certain conditions using a hot aqueous diluent containing 2 to 15% by weight of pigment in the crude of ammonium hydroxide, tetramethyl ammonium hydroxide or certain amines.
    Type: Grant
    Filed: August 20, 1974
    Date of Patent: April 20, 1976
    Assignee: Hercules Incorporated
    Inventor: Calvin C. Wanser