Granted Patent
Utility
US 6,561,769 · App. 09/914,353
Filter and muffler for a vacuum pump
Inventor:
Peter Tell
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Aug 27, 2001
Inventor
Peter Tell
Assignee (at issue)
PIAB AB
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.