Granted Patent
Utility
US 5,331,810 · App. 07/886,963
Low thermal capacitance exhaust system for an internal combustion engine
Inventors:
Keith C. Ingermann, Robert T. Usleman
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: May 21, 1992
Inventors
Keith C. Ingermann
Robert T. Usleman
Assignee (at issue)
Arvin Industries, Inc.
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.