Granted Patent
Utility
US 6,769,511 · App. 10/368,897
Variable tuned exhaust system
Inventors:
Norman Brooks, Doru N. Serban
Patented Case
View Patent ↗
Granted: Aug 3, 2004
Filed: Feb 18, 2003
Inventors
Norman Brooks
Doru N. Serban
Assignee (at issue)
GENERAL MOTORS OF CANADA 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.