Patents by Inventor Thelma Spivack

Thelma Spivack 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).

  • N-allyl substituted phenylenediamine stabilizers
    Patent number: 5213699
    Abstract: N-Allyl substituted p-phenylenediamine compounds are very effective antioxidant stabilizers for organic material subject to oxidative or thermal degradation, particularly for lubricant compositions.
    Type: Grant
    Filed: September 10, 1992
    Date of Patent: May 25, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: Joseph E. Babiarz, Thelma Spivack