Granted Patent
Utility
US 6,051,196 · App. 09/247,745
Purification of phosphorus containing scheelite ore
Inventors:
Raj Pal Singh, Michael J. Miller, Thomas A. Wolfe
Patented Case
View Patent ↗
Granted: Apr 18, 2000
Filed: Feb 9, 1999
Inventors
Raj Pal Singh
Michael J. Miller
Thomas A. Wolfe
Assignee (at issue)
OSRAM SYLVANIA Inc.
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.