Granted Patent
Utility
US 5,175,136 · App. 07/615,307
Monolithic catalysts for conversion of sulfur dioxide to sulfur trioxide
Inventor:
Timothy R. Felthouse
Patented Case
View Patent ↗
Granted: Dec 29, 1992
Filed: Nov 19, 1990
Inventor
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.