Granted Patent
Utility
US 6,160,189 · App. 08/433,272
Reducing the monovinyl acetylene and/or butadiene content of impure vinyl chloride
Inventors:
Ronald D. Olinger, Michael B. Guidry
Patented Case
View Patent ↗
Granted: Dec 12, 2000
Filed: May 2, 1995
Inventors
Ronald D. Olinger
Michael B. Guidry
Assignee (at issue)
PPG Industries Ohio, 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.