Patents by Inventor J. Frederick Martin

J. Frederick Martin 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).

  • Inhibitors of color formation in alkanolamines
    Patent number: 5693866
    Abstract: In the thermal processing of crude alkanolamines, a method of inhibiting color formation in the alkanolamines comprising adding an amount, effective for the purpose, of an alkali metal hydroxide or sulfite, or mixtures thereof.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: December 2, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Paul V. Roling, Quincy K. A. Sintim, J. Frederick Martin
  • 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