Granted Patent
Utility
US 6,235,253 · App. 09/324,333
Recovering vanadium oxides from petroleum coke by melting
Inventors:
Thomas C. Holcombe, Donald P. Malone
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Jun 2, 1999
Inventors
Thomas C. Holcombe
Donald P. Malone
Assignees (at issue)
Marathon Ashland Petroleum LLC
Envi Res LLC
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.