Patents by Inventor Norbert Kaufmann

Norbert Kaufmann 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).

  • Use of test strips to determine the UV intensity or to pre-determine the duration of stay in the sun without sunburn
    Patent number: 5589398
    Abstract: The invention concerns the use of test strips with a flat, preferably oblong foil which carries a matrix containing a photoactive chromogenic substance to pre-determine the duration of stay in the sun that is possible without sunburn, a test system for this determination containing test strips and a test strip pack, a test strip pack and a method for the pre-determination of the maximum possible duration of stay in the sun without sunburn using the test system.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: December 31, 1996
    Assignee: Boehringer Mannheim GmbH
    Inventors: Manfred Krause, Norbert Kaufmann, Mathias Neumann