Granted Patent
Utility
US 5,968,368 · App. 09/170,869
Purification process
Inventors:
Richard Powell, Alan John Handley, Richard Dominic Clarke
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Oct 14, 1998
Inventors
Richard Powell
Alan John Handley
Richard Dominic Clarke
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.