Granted Patent
Utility
US 5,426,217 · App. 08/001,548
Process for the production of therephthalic acid
Inventors:
David John Royall, James Lumsden Harvie
Patented Case
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Granted: Jun 20, 1995
Filed: Jan 6, 1993
Inventors
David John Royall
James Lumsden Harvie
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.