Granted Patent
Utility
US 5,928,479 · App. 08/716,370
Process for the purification of pentafluoroethane
Inventors:
Paul Nicholas Ewing, Stuart Corr, John Martin, Michael John Watson
Patented Case
View Patent ↗
Granted: Jul 27, 1999
Filed: Sep 19, 1996
Inventors
Paul Nicholas Ewing
Stuart Corr
John Martin
Michael John Watson
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.