Granted Patent
Utility
US 4,865,693 · App. 07/242,574
Preparation of complexes of zirconium and hafnium tetrachlorides with phosphorus oxychloride
Inventor:
David F. McLaughlin
Patented Case
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Granted: Sep 12, 1989
Filed: Sep 12, 1988
Inventor
David F. McLaughlin
Assignee (at issue)
Westinghouse Electric Company LLC
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.