Patents by Inventor Edward Ephraim Jaffe

Edward Ephraim Jaffe 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).

  • Oxidation process for highly dispersible quinacridone pigments
    Patent number: 6867301
    Abstract: A process for the preparation of a quinacridone comprises oxidation of a 6,13-dihydroquinacridone using hydrogen peroxide, wherein a polymeric dispersant is present in the oxidation reaction mixture. The resulting pigment products exhibit greatly improved dispersibility relative to pigments in which the polymeric dispersant is not present during the oxidation reaction.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: March 15, 2005
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Ulrich Schädeli, Edward Ephraim Jaffe, Linda SnyderAllen
  • Oxidation process for highly dispersible quinacridone pigments
    Publication number: 20040138458
    Abstract: A process for the preparation of a quinacridone comprises oxidation of a 6,13-dihydroquinacridone using hydrogen peroxide, wherein a polymeric dispersant is present in the oxidation reaction mixture. The resulting pigment products exhibit greatly improved dispersibility relative to pigments in which the polymeric dispersant is not present during the oxidation reaction.
    Type: Application
    Filed: December 23, 2003
    Publication date: July 15, 2004
    Inventors: Ulrich Schadeli, Edward Ephraim Jaffe, Linda SnyderAllen
  • Finishes containing light interference pigments
    Patent number: 5871827
    Abstract: This application discloses two-coat and three-coat automotive finishes, articles coated by an automotive finish and a process for their preparation wherein polychromism is achieved in the finish by incorporating an opaque, light interference pigment into the topcoat or a midcoat. The invention further relates to a coating composition which contains an opaque interference pigment at a pigment to binder ratio of less than 7/100.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: February 16, 1999
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Edward Ephraim Jaffe, Franklin Roberts Hilfiker, Milton John Misogianes
  • Colorant blends containing a salt-forming azo pigment and a pyrrolopyrrole pigment
    Patent number: 5869625
    Abstract: The present invention relates to colorant blends comprising (a) an azo component, which is a salt of a salt-forming azo pigment of the formulaA--N.dbd.N--B,wherein A is the residue of a diazo component and B is the residue of a coupling component; and (b) a second component, which is an opaque 1,4-diketo-3,6-diaryl-pyrrolo?3,4-c!pyrrole pigment. The colorant blends are especially useful in coating compositions, such as paints.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: February 9, 1999
    Assignee: Ciba Specialty Chemical Corporation
    Inventors: Edward Ephraim Jaffe, James Martin Delaney
  • 2,9-Dichloroquinacridone pigment compositions
    Patent number: 4015998
    Abstract: The disclosure teaches the preparation of a unique 2,9-dichloroquinacridone which provides a heat stable, highly dispersible magenta colorant suitable for use in plastics and the like where heat stability and lightfastness are necessary. The disclosure further teaches a pigmentary composition wherein the unique 2,9-dichloroquinacridone is combined with molybdate orange pigment to give a true red pigment of superior intensity, lightfastness and heat stability.
    Type: Grant
    Filed: September 24, 1975
    Date of Patent: April 5, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Edward Ephraim Jaffe
  • Yellow azo pigment and process of preparation from dichloroaniline and barbituric acid
    Patent number: 3979377
    Abstract: Yellow azo pigment is prepared by coupling 2,4- or 2,5-dichloroaniline with barbituric acid. In coating compositions these pigments provide high color strength, hiding power, lightfastness and bleed resistance and are particularly useful in industrial finishes.
    Type: Grant
    Filed: August 8, 1974
    Date of Patent: September 7, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Edward Ephraim Jaffe, William Joseph Marshall, Ernest Anton Stefancsik