Granted Patent
Utility
US 4,673,058 · App. 06/861,525
High performance automotive muffler
Inventors:
Peter R. Roberts, Sydney Sheung Chee Chung
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: May 9, 1986
Inventors
Peter R. Roberts
Sydney Sheung Chee Chung
Assignee (at issue)
G Enterprises Limited
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.