Granted Patent
Utility
US 4,258,547 · App. 05/678,269
Engine cylinder head having thermal insulation in a coolant passage adjacent an exhaust outlet
Inventor:
Gordon W. Fenn
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Apr 19, 1976
Inventor
Gordon W. Fenn
Assignee (at issue)
Chrysler Group LLC
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.