Patents by Inventor Hans-Joachim Topfer

Hans-Joachim Topfer 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).

  • Patent number: 5731065
    Abstract: In order to improve the handling and filtering characteristics of a multilayered, textile, gas-permeable filter material against toxic chemical substances and, in particular, filter and protective materials for the production of sheet-like filters and protective suits for the civil and military fields, it is suggested that this filter material have a first layer as textile support layer which is bonded to a second layer present in the form of an areal adhesive layer. In addition, the filter material has a third layer applied to the second layer and areally bonded thereto, this third layer comprising a textile sheet-like layer containing activated carbon fibers.
    Type: Grant
    Filed: January 6, 1995
    Date of Patent: March 24, 1998
    Assignee: Alfred Karcher GmbH & Co.
    Inventors: Helmut Stelzmuller, Hans-Joachim Topfer, Gerhard Stabler, Thomas Stoll