Granted Patent
Utility
US 6,209,678 · App. 09/431,294
Pneumatic hand tool exhaust muffler
Inventor:
Robert E. Sterling
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Oct 29, 1999
Inventor
Robert E. Sterling
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.