Patents by Inventor Hans Mandel

Hans Mandel 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).

  • Polyurethane sandwich structure element and process for production thereof
    Patent number: 5856371
    Abstract: For the production of sandwich structure elements comprising non-cellular polyurethane layers and polyurethane foamed layers which are produced on a substrate by the application of layers to a substrate, it is proposed that at least the non-cellular polyurethane layers contain 15 to 55% by weight of mica. Sandwich structure elements are obtained which are particularly dimensionally accurate and which adhere well. The effect is believed to be based on a non-homogeneous curing reaction of the mixture which reacts to form polyurethane, due to the presence of mica.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: January 5, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Grimm, Heinz Hausmann, Hans Mandel, Ernst-Christoph Prolingheuer