Granted Patent
Utility
US 4,836,330 · App. 07/227,759
Plural chamber stamp formed muffler with single intermediate tube
Inventors:
Jon W. Harwood, Mark S. Kimmet
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Aug 3, 1988
Inventors
Jon W. Harwood
Mark S. Kimmet
Assignee (at issue)
AP 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.