Patents by Inventor Hans Harald Gehrt

Hans Harald Gehrt 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 the distortion-free coloration of polyolefins with organic pigments
    Patent number: 4049615
    Abstract: A process for the distortion-free dope coloration of polyolefins with organic pigments, wherein the organic pigment is coated with a melamine-formaldehyde resin which is then cured.
    Type: Grant
    Filed: February 19, 1976
    Date of Patent: September 20, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Anton Elsener, Hans Harald Gehrt, Bernhard Medinger, Volkhard Wiese