Granted Patent
Utility
US 5,489,720 · App. 08/269,307
Methods for inhibiting vinyl aromatic monomer polymerization
Inventor:
Graciela B. Arhancet
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: Jun 30, 1994
Inventor
Graciela B. Arhancet
Assignee (at issue)
Betz Laboratories, 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.