Granted Patent
Utility
US 6,270,742 · App. 09/051,508
Hydrogen fluoride recovery process
Inventors:
Paul Nicholas Ewing, Charles John Shields, Christopher Roberts
Patented Case
View Patent ↗
Granted: Aug 7, 2001
Filed: Apr 8, 1998
Inventors
Paul Nicholas Ewing
Charles John Shields
Christopher Roberts
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.