Granted Patent
Utility
US 4,247,481 · App. 06/106,587
Catalyst passivation in production of amines
Inventors:
Charles R. Campbell, Charles E. Cutchens
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Dec 26, 1979
Inventors
Charles R. Campbell
Charles E. Cutchens
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.