Granted Patent
Utility
US 5,819,158 · App. 08/866,876
Reclamation of tungsten values from tungsten-thoria
Inventors:
Claraence D. Vanderpool, Thomas A. Wolfe, Michael J. Miller
Patented Case
View Patent ↗
Granted: Oct 6, 1998
Filed: May 30, 1997
Inventors
Claraence D. Vanderpool
Thomas A. Wolfe
Michael J. Miller
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.