Patents by Inventor Andre Herdenberger

Andre Herdenberger 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 coloring or dying fibrous sheets impregnated with bituminous material
    Patent number: 4173675
    Abstract: The present invention relates to a process for coloring or dyeing a material formed essentially from a substrate impregnated with bitumen, said method being characterized in that a colored composition is applied, in particular a pigmented composition, to the substrate before the impregnation of the latter by the bitumen. It also concerns the material thus obtained, characterized by a color gradient between the surface and the inside of the substrate, the color intensity decreasing continuously and practically regularly from the surface.
    Type: Grant
    Filed: May 26, 1977
    Date of Patent: November 6, 1979
    Assignee: Societe Anonyme dite: Omnium Francais Industriel et Commercial (O.F.I.C.)
    Inventors: Roger Vallon, Andre Herdenberger, Marc Delhomelle