Patents Examined by William E. Parks
  • Method of stabilizing organic materials employing pyrazole compounds and stabilized compositions thereof
    Patent number: 4008200
    Abstract: The present invention concerns a novel method of stabilizing organic material susceptible to degradation under the effect of heat, oxidation or ultra-violet light which comprises treating said material with a compound of the formula: ##STR1## WHEREIN R.sub.1, R.sub.2 and R.sub.3 are substituents, e.g. alkyl and Me is hydrogen or a metal cation.
    Type: Grant
    Filed: April 11, 1975
    Date of Patent: February 15, 1977
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer, Martin Preiswerk