Granted Patent
Utility
US 4,476,246 · App. 06/461,119
Doubly promoted platinum group metal catalysts for emission control
Inventors:
Gwan Kim, Michael V. Ernest
Patented Case
View Patent ↗
Granted: Oct 9, 1984
Filed: Jan 26, 1983
Inventors
Gwan Kim
Michael V. Ernest
Assignee (at issue)
W. R. Grace & Co.
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.