Patents by Inventor Ronald S. Tyson

Ronald S. Tyson 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).

  • Crystalline form of quinacridone
    Patent number: 4024148
    Abstract: A new crystalline form of quinacridone is prepared by conditioning crude quinacridone with a water-insoluble liquid having at least one hydroxyl group, a surfactant, and water.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: May 17, 1977
    Assignee: Sun Chemical Corporation
    Inventors: Ronald S. Tyson, Leonard Shapiro