Granted Patent
Utility
US 6,609,489 · App. 10/140,914
Apparatus and method for reducing engine noise
Inventors:
Thomas Alan Slopsema, Gary L. Martinson
Patented Case
View Patent ↗
Granted: Aug 26, 2003
Filed: May 7, 2002
Inventors
Thomas Alan Slopsema
Gary L. Martinson
Assignee (at issue)
General Motors LLC
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.