Granted Patent
Utility
US 4,928,372 · App. 07/335,120
Process for manufacturing stamp formed mufflers
Inventors:
Jon W. Harwood, Wayne A. Karlgaard, Michael Clegg
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Apr 7, 1989
Inventors
Jon W. Harwood
Wayne A. Karlgaard
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.