Granted Patent
Utility
US 5,275,996 · App. 07/887,254
Phosphorous/vanadium oxide catalyst and process of preparation thereof
Inventors:
William J. Andrews, Jerry R. Ebner, Timothy R. Felthouse
Patented Case
View Patent ↗
Granted: Jan 4, 1994
Filed: May 22, 1992
Inventors
William J. Andrews
Jerry R. Ebner
Timothy R. Felthouse
Assignee (at issue)
Monsanto 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.