Granted Patent
Utility
US 4,333,545 · App. 06/187,263
Back-fire resistant lock seam for muffler shells
Inventor:
Peter R. Roberts
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: Sep 15, 1980
Inventor
Peter R. Roberts
Assignee (at issue)
Thrush Co., 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.