Granted Patent
Utility
US 4,426,320 · App. 06/394,220
Catalyst composition for exhaust gas treatment
Inventors:
Michael V. Ernest, James M. Maselli
Patented Case
View Patent ↗
Granted: Jan 17, 1984
Filed: Jun 17, 1982
Inventors
Michael V. Ernest
James M. Maselli
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.