Granted Patent
Utility
US 6,428,764 · App. 09/565,352
Process for the production of calcium fluoride
Inventors:
John Byrne Michel, Paul Douglas Vernooy
Patented Case
View Patent ↗
Granted: Aug 6, 2002
Filed: May 5, 2000
Inventors
John Byrne Michel
Paul Douglas Vernooy
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.