Granted Patent
Utility
US 5,932,184 · App. 08/271,569
Method for recovery of tungsten from spent catalysts
Inventors:
Michael J. Miller, Clarence D. Vanderpool
Patented Case
View Patent ↗
Granted: Aug 3, 1999
Filed: May 26, 1992
Inventors
Michael J. Miller
Clarence D. Vanderpool
Assignee (at issue)
GTE Products Corporation
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.