Patents by Inventor Robert Dippelhofer

Robert Dippelhofer 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 production of dyed acrylic fibres
    Patent number: 4087494
    Abstract: This invention relates to a process for the production of dyed filaments or fibres of acrylonitrile polymers, wherein carbon black pigments are added to the polymer before the spinning process and the filament containing carbon black pigments are dyed. By this process it is possible to save considerable amounts of dye-stuff.
    Type: Grant
    Filed: December 11, 1975
    Date of Patent: May 2, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ulrich Reinehr, Hans-Dieter Braun, Robert Dippelhofer