Patents by Inventor Hans-Christian Riekhof

Hans-Christian Riekhof 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).

  • Multilayered label
    Patent number: 5843547
    Abstract: Multilayered label comprisinga) a base layer made of plastic containingb) an additive which exhibits a color change under light radiation, in particular laser irradiation, and whichc) is coated on one side with a self-adhesive composition whichd) is, if desired, covered by a release paper or a release film, wheree) the base layer is covered on the other side by one or more protective films arranged one on top of the other whichf) are transparent, permeable to laser irradiation and are provided with a self-adhesive coating.
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: December 1, 1998
    Assignee: Beiersdorf AG
    Inventors: Klaus Kulper, Hans-Christian Riekhof, Arne Koops