Granted Patent
Utility
US 5,648,574 · App. 08/622,133
Compositions and methods for inhibiting vinyl aromatic monomer polymerization
Inventors:
Graciela B. Arhancet, Inge K. Henrici
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Mar 26, 1996
Inventors
Graciela B. Arhancet
Inge K. Henrici
Assignee (at issue)
Betzdearborn, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.