Granted Patent
Utility
US 6,340,781 · App. 08/374,669
Purification of pentafluoroethane
Inventors:
Charles John Shields, Gary Goodyear
Patented Case
View Patent ↗
Granted: Jan 22, 2002
Filed: Apr 3, 1995
Inventors
Charles John Shields
Gary Goodyear
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.