Granted Patent
Utility
US 4,821,391 · App. 06/873,799
Machine for forming automotive muffler mechanical lock joint
Inventor:
Robert J. Paterick
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Jun 13, 1986
Inventor
Robert J. Paterick
Assignee (at issue)
Maremont Corporation
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.