Patents by Inventor Andre Freund

Andre Freund 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: 6024782
    Abstract: A gas filter media with a parallel layer structure, which comprise individual layers of adhesive and adsorbent particles, wherein the thermoplastic adhesive is solvent-free and is preferably based on polypropylene or polyethylene. Using the manufacturing process according to the present invention, it is possible to intentionally prepare gas filter media with adjustable packing density and pressure drop. The gas filter media according to the present invention can be used in respirator filters, room air filters, in ventilation filters for vehicles, or in apparatus filters.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: February 15, 2000
    Assignee: Dragerwerk AG
    Inventors: Andre Freund, Klaus Ammann, Gerhold Muhmel