Patents by Inventor Graciela B. Arhancet

Graciela B. Arhancet 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).

  • Compositions and methods for inhibiting vinyl aromatic monomer polymerization
    Patent number: 5426257
    Abstract: Compositions and methods for inhibiting polymerization of vinyl aromatic monomers in oxygen-free processing systems are disclosed. The compositions comprise an oxime compound and a hydroxylamine compound and, alternatively, an oxime compound, a hydroxylamine compound and a phenylenediamine compound. The methods comprise adding either of the compositions to the vinyl aromatic monomer in an amount ranging from 1 to about 10,000 parts per million parts monomer.
    Type: Grant
    Filed: June 3, 1994
    Date of Patent: June 20, 1995
    Assignee: Betz Laboratories, Inc.
    Inventor: Graciela B. Arhancet
  • Methods for inhibiting ethylenically unsaturated monomers
    Patent number: 5416258
    Abstract: Methods and compositions are provided for inhibiting the polymerization of butadiene-containing streams during elevated temperature processing thereof or during storage or shipment of monomer containing product. The composition comprises a combination of (a) a phenylenediamine compound having at least one N--H bond and (b) a hydroxytoluene compound. The methods comprise adding from about 1-250 ppm of the combination to the monomer medium, per one million parts of medium.
    Type: Grant
    Filed: January 14, 1994
    Date of Patent: May 16, 1995
    Assignee: Betz Laboratories, Inc.
    Inventors: Graciela B. Arhancet, Paul V. Roling
  • Compositions and methods for inhibiting vinyl aromatic monomer polymerization
    Patent number: 5396004
    Abstract: Methods and compositions are provided for inhibiting the polymerization of vinyl aromatic monomers under distillation conditions. The compositions comprise a combination of a phenylenediamine compound and a hydroxylamine compound.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: March 7, 1995
    Assignee: Betz Laboratories, Inc.
    Inventors: Graciela B. Arhancet, Inge K. Henrici
  • Compositions and methods for inhibiting polymerization of ethlenically unsaturated monomers
    Patent number: 5396005
    Abstract: Disclosed are compositions and methods for inhibiting polymerization of ethylenically unsaturated monomers. The compositions comprise a methoxyphenol compound selected from the group consisting eugenol and 2-tert-butyl-4-hydroxyanisole and a phenylenediamine compound. The methods comprise adding from about 1 to about 10,000 parts per million to the ethylenically unsaturated monomer during processing.
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: March 7, 1995
    Assignee: Betz Laboratories, Inc.
    Inventor: Graciela B. Arhancet