Granted Patent
Utility
US 5,164,551 · App. 07/624,888
Stamp formed muffler with compound reinforcement pattern for preventing shell ring
Inventors:
Jon W. Harwood, Michael Clegg
Patented Case
View Patent ↗
Granted: Nov 17, 1992
Filed: Dec 3, 1990
Inventors
Jon W. Harwood
Michael Clegg
Assignee (at issue)
AP Parts Manufacturing Company
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.