Granted Patent
Utility
US 6,224,844 · App. 09/393,914
Process for the production of calcium fluoride
Inventors:
Paul Douglas Vernooy, John Byrne Michel
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Sep 10, 1999
Inventors
Paul Douglas Vernooy
John Byrne Michel
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.