Patents by Inventor Peter Klemchuk

Peter Klemchuk 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).

  • Pyromellitic dimiides of 3,5-dialkyl-4-hydroxyphenylsubstituted amines
    Patent number: 4116930
    Abstract: Pyromellitic diimides of 3,5-dialkyl-4-hydroxyphenylsubstituted amines of this invention effectively stabilize organic materials against the effects of heat and oxygen. The diimides of this invention are prepared by reacting the appropriate 3,5-dialkyl-4-hydroxyphenylsubstituted amine with pyromellitic anhydride or pyromelletic diimide. An example of this class of stabilizer is N,N'-bis(3,5-di-t-butyl-4-hydroxyphenyl)pyromellitic diimide.
    Type: Grant
    Filed: September 14, 1976
    Date of Patent: September 26, 1978
    Assignee: Ciba-Geigy Corporation
    Inventors: Martin Dexter, Martin Knell, Peter Klemchuk, John F. Stephen