Patents by Inventor Gertraude Muller

Gertraude Muller 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).

  • Stable crystalline lithium nitride and process for its preparation
    Patent number: 4234554
    Abstract: Crystalline lithium nitride, stable in air, characterized by a sodium content of less than 5.times.10.sup.-2 weight-percent, a potassium content of less than 10.sup.-2 weight-percent, a magnesium content of less than 1.times.10.sup.-2 weight-percent, and a silicon and iron content of 10.sup.-2 to 10.sup.-3 weight-percent each; is obtained by heating lithium having a purity of at least 99.9% in a vessel made of tungsten, niobium, ruthenium or tantalum in a nitrogen atmosphere at a pressure of at least 250 mm Hg in the absence of oxygen and water at a temperature of from 300.degree. C. to the melting point of lithium nitride.
    Type: Grant
    Filed: July 28, 1978
    Date of Patent: November 18, 1980
    Assignee: Max-Planck-Gesellschaft zur forderung der Wissenschaften e.V.
    Inventors: Albrecht Rabenau, Ulrich von Alpen, Erich Schonherr, Gertraude Muller