Granted Patent
Utility
US 4,457,895 · App. 06/434,033
Catalytic muffler for purifying the exhaust gases of an internal combustion engine
Inventor:
Michel Prigent
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Oct 13, 1982
Inventor
Michel Prigent
Assignee (at issue)
INSTITUT FRANCAIS DU PETROLE
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.