Granted Patent
Utility
US 5,157,175 · App. 07/767,395
Composition and method for inhibition of styrene polymerization
Inventors:
Vincent E. Lewis, Porcia E. West
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: Sep 9, 1991
Inventors
Vincent E. Lewis
Porcia E. West
Assignee (at issue)
Nalco Chemical Company
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.