Patents by Inventor Ivan C. Popoff

Ivan C. Popoff 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-(Oxazolidinothio) imides that provide scorch retardant nonblooming elastomeric compositions
    Patent number: 4275014
    Abstract: A selected group of N-(oxazolidinothio) imides are active as scorch retarders without causing bloom in both unsaturated elastomers and elastomers with a slight degree of unsaturation.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: June 23, 1981
    Assignee: Pennwalt Corporation
    Inventors: Ivan C. Popoff, Everett A. Mailey, Paul G. Haines
  • 2-Trichloromethyloxazolidine and thiazolidine derivatives useful as flame retardants for polyurethane foam
    Patent number: 4226948
    Abstract: A rigid polyurethane foam is prepared from a reaction mixture incorporating therein a 2-trichloromethyloxazolidine or a thiazolidine derivative for imparting to the foam smoke and flame retardancy.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: October 7, 1980
    Assignee: Pennwalt Corporation
    Inventors: Ivan C. Popoff, Stanley R. Sandler
  • N-(Oxazolidinothio) imides that provide scorch retardant nonblooming elastomeric compositions
    Patent number: 4220589
    Abstract: A selected group of N-(oxazolidinothio) imides are active as scorch retarders without causing bloom in both unsaturated elastomers and elastomers with a slight degree of unsaturation.
    Type: Grant
    Filed: May 23, 1978
    Date of Patent: September 2, 1980
    Assignee: Pennwalt Corporation
    Inventors: Ivan C. Popoff, Everett A. Mailey, Paul G. Haines
  • Purification of N,N'-disubstituted p-phenylenediamine antiozonants and oil stabilizers
    Patent number: 4131622
    Abstract: Process for purifying N,N'-disubstituted p-phenylenediamine antiozonants and oil stabilizers utilizes a steam-distillation step to remove Schiff's base derivatives of p-phenylenediamine and N-monosubstituted p-phenylenediamine as well as aldehyde and ketone contaminants and corresponding alcohols thereof.
    Type: Grant
    Filed: May 18, 1977
    Date of Patent: December 26, 1978
    Assignee: Pennwalt Corporation
    Inventors: Ivan C. Popoff, Paul G. Haines