Patents by Inventor Helen M. Chobert

Helen M. Chobert 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).

  • Method for preparing a pigment for polyvinylchloride coloring
    Patent number: 6124379
    Abstract: A system providing desirable properties for introducing a pigment to a polar polymer such as polyvinylchloride resin is disclosed. The system also is valuable in that pigments are conveniently dissolved or dispersed and blended in an a polyester component which is otherwise useful for polar polymer processing. Also disclosed is the mixing of the polyester component, phthalocyanine compounds, and the polyvinylchloride resins. Stronger color development is obtained by using the system of the present invention.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: September 26, 2000
    Inventors: Helen M. Chobert, Robert A. Lindner