Patents by Inventor Harald Woltersdorf

Harald Woltersdorf 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).

  • Forming solid, adhesive-free composite of membrane filters and cellulosic cardboard
    Patent number: 4042733
    Abstract: A solid, adhesive-free, layered composite material consisting of two clearly defined layers, one made of membrane filters and the other of porous material, the said composite material being formed by bringing a polymeric membrane filter forming substance in its gel condition into contact with the porous material, and solidifying the said gel on the porous material; the composite material is useful as a nutrient medium carrier for microbiological tests.
    Type: Grant
    Filed: May 25, 1976
    Date of Patent: August 16, 1977
    Assignee: Boehringer Ingelheim GmbH
    Inventors: Karl Buchta, Mohamed Abdou, Harald Woltersdorf