Patents by Inventor Joseph William Conley

Joseph William Conley 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).

  • Process for improving lightfastness of an azo pigment by heat treatment
    Patent number: 3991044
    Abstract: A process for improving the light-fastness of pigments of the Hansa Yellow and Diarylide Yellow class is described. Azo pigments prepared by coupling diazotized primary aromatic monoamines or tetrazotized primary aromatic diamines with acetoacetarylides in aqueous medium in the absence of surfactants are heated prior to or after separation from the aqueous medium at 120.degree. to about 250.degree. C. until the pigment is converted to crystalline particles having an average particle diameter at least twice that of the pigment which has not been heat treated.
    Type: Grant
    Filed: September 26, 1972
    Date of Patent: November 9, 1976
    Assignee: Hercules Incorporated
    Inventor: Joseph William Conley