Patents by Inventor Inge K. Henrici

Inge K. Henrici 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: 5773674
    Abstract: The polymerization of a vinyl aromatic monomer such as styrene is inhibited by the addition of a composition of a benzoquinone derivative and a hydroxylamine compound.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: June 30, 1998
    Assignee: BetzDearborn Inc.
    Inventors: Graciela B. Arhancet, Inge K. Henrici
  • Compositions and methods for inhibiting vinyl aromatic monomer polymerization
    Patent number: 5648573
    Abstract: The polymerization of a vinyl aromatic monomer such as styrene is inhibited by the addition of a composition of a benzoquinone derivative and a hydroxylamine compound.
    Type: Grant
    Filed: June 12, 1995
    Date of Patent: July 15, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Graciela B. Arhancet, Inge K. Henrici
  • Compositions and methods for inhibiting vinyl aromatic monomer polymerization
    Patent number: 5648572
    Abstract: Compositions and methods for inhibiting vinyl aromatic monomer polymerization during processing are disclosed. The compositions comprise a dinitrosalicylic acid derivative and a hydroxylamine compound. The methods comprise adding the composition to the monomer during processing. The preferred composition comprises 3,5-dinitrosalicylic acid or 3,5-dinitrosalicylic methyl ester and bis-(hydroxypropyl)hydroxylamine.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: July 15, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Graciela B. Arhancet, Inge K. Henrici, J. Frederick Martin
  • Compositions and methods for inhibiting vinyl aromatic monomer polymerization
    Patent number: 5648574
    Abstract: Compositions and methods for inhibiting the polymerization of vinyl aromatic monomers in oxygen-free processing systems are disclosed. The compositions comprise a hydroxylamine compound, a phenylenediamine compound and a vinyl aromatic monomer. The methods comprise adding to the monomer bis-N,N'(hydroxypropyl)hydroxylamine.
    Type: Grant
    Filed: March 26, 1996
    Date of Patent: July 15, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Graciela B. Arhancet, Inge K. Henrici
  • Methods for inhibiting vinyl aromatic monomer polymerization
    Patent number: 5510547
    Abstract: Methods for inhibiting the polymerization of vinyl aromatic monomers in oxygen-free processing systems are disclosed. The methods comprise adding from 1 to 10,000 parts of a combination of a hydroxylamine compound and a phenylenediamine compound to the vinyl aromatic monomer.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: April 23, 1996
    Assignee: Betz Laboratories, Inc.
    Inventors: Graciela B. Arhancet, Inge K. Henrici
  • 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
  • Antioxidant compositions and methods using catechol compounds and organic acid compounds
    Patent number: 5221461
    Abstract: A method for inhibiting fouling during the elevated temperature processing of hydrocarbon comprising adding to the hydrocarbon a composition comprising a catechol having the structure: ##STR1## wherein R is H or C.sub.1 -C.sub.10 alkyl and, an organic acid.
    Type: Grant
    Filed: June 9, 1992
    Date of Patent: June 22, 1993
    Assignee: Betz Laboratories, Inc.
    Inventors: Inge K. Henrici, Dwight K. Reid