Granted Patent
Utility
US 6,544,319 · App. 10/050,352
Purification of hexafluoro-1,3-butadiene
Inventors:
Steven Arnold Krouse, John Chodur
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Jan 16, 2002
Inventors
Steven Arnold Krouse
John Chodur
Assignee (at issue)
Air Products and Chemicals, 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.