Granted Patent
Utility
US 6,046,367 · App. 08/320,624
Triphenylbis (fluoroalkoxy) phosphoranes and fluorinated ketals
Inventor:
Zhen-Yu Yang
Patented Case
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Granted: Apr 4, 2000
Filed: Oct 7, 1994
Inventor
Zhen-Yu Yang
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.