Patents by Inventor Ernst Freundlinger

Ernst Freundlinger 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).

  • Flexible graphite sheet, material or layer containing metal molybdate
    Patent number: 4296177
    Abstract: Flexible graphite layer material containing at least one metal moylbdate with a solubility in water of 10.sup.-2 to 10.sup.-4 g/100 ml to inhibit corrosion. The corrosion inhibitor may be incorporated by first immersing the graphite layer material in a solution of an alkali metal molybdate, drying, and then immersing in a solution of very soluble metal salt in which the metal when combined with molybdate to form metal molybdate has the defined solubility. The graphite layer material is then dried and contains the desired molybdate corrosion inhibitor.
    Type: Grant
    Filed: December 21, 1979
    Date of Patent: October 20, 1981
    Assignee: Sigri Elektrographit GmbH
    Inventors: Ernst Freundlinger, Alfred Hirschvogel
  • Flexible graphite sheet material treated with an alkali metal salt containing at least one of the elements chromium, molybdenum and tungsten
    Patent number: 4216266
    Abstract: A flexible graphite laminate produced by compacting expanded graphite having incorporated an alkali metal salt containing at least one of the elements chromium, molybdenum and tungsten. The alkali metal salt reduces the corrosive properties of the flexible graphite laminate. The alkali metal salt may be incorporated during or after manufacture of the flexible graphite laminate from graphite.
    Type: Grant
    Filed: September 21, 1978
    Date of Patent: August 5, 1980
    Assignee: Sigri Elektrographit Gesellschaft mit beschrankter Haftung
    Inventors: Alfred Hirschvogel, Ernst Freundlinger