Patents by Inventor Manfred Barenz

Manfred Barenz 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).

  • Contact lens
    Patent number: 5069542
    Abstract: A contact lens has an elliptical inside surface with a numerical eccentricity of 0.2 to 0.5 and a zenith radius of curvature of 8.0 to 8.4 mm. The inside surface preferably has a peripheral, circularly cross sectioned bevelled zone. As a soft contact lens, it has these dimensions when fully hydrated and preferably consists of a copolymer comprising of 50% to 90% hydroxyethyl-methacrylate (HEMA) by weight, 2% to 20% one or more unsaturated carboxylic acids, 2% to 20% one or more base monomers, 5% to 25% aliphatic acrylate or methacrylate, and 0.1% to 1% of a dialkylene-glycol-dimethacrylate cross-linker.
    Type: Grant
    Filed: April 21, 1988
    Date of Patent: December 3, 1991
    Assignee: Titmus Eurocon Kontaktlinsen GmbH & Co. KG.
    Inventors: Peter Hofer, Ulrich Muller, Manfred Barenz, Horst Schafer, Wolfgang Muller-Lierheim
  • Contact lens and compositions
    Patent number: 4463148
    Abstract: A soft contact lens having in preferred embodiment an elliptical inside surface which has a numerical eccentricity of 0.2 to 0.5 and a zenith radium of curvature of 8.0 to 8.4 mm. It preferably consists of a copolymer comprising of 50% to 90% hydroxyethyl-methacrylate (HEMA) by weight, 2% to 20% one or more unsaturated carboxylic acids, 2% to 20% one or more base monomers, 5% to 25% aliphatic acrylate or methacrylate, and 0.1% to 1% of a dialkylene-glycol-dimethacrylate crosslinker.
    Type: Grant
    Filed: May 6, 1983
    Date of Patent: July 31, 1984
    Assignee: Titmus Eurocon Kontaktlinsen GmbH KG & Co.
    Inventors: Peter Hofer, Ulrich Muller, Manfred Barenz, Horst Schafer, Wolfgang Muller-Lierheim