Patents by Inventor Gudrun Petzold

Gudrun Petzold 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).

  • Permanent hydrophobic and oleophotic modification for polymer surfaces and process of making same
    Patent number: 5856246
    Abstract: The invention concerns a thin film of a permanent hydrophobic and optionally oleophobic finish for polymer surfaces. The film is formed from at least one layer of a water-soluble polycation and cationic synthetic resin. For further improvement of the oleophobic and permanent hydrophobic properties the film can additionally contain a long-chain surfactant or an alkyl-substituted polyanion.
    Type: Grant
    Filed: March 26, 1997
    Date of Patent: January 5, 1999
    Inventors: Richard Witzko, Wolfgang Burger, Gudrun Petzold, Klaus Lunkwitz, Heide-Marie Buchhammer