Granted Patent
Utility
US 6,464,211 · App. 09/914,666
Diffuser assembly
Inventor:
Ernest W. Downs
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: Nov 16, 2001
Inventor
Ernest W. Downs
Assignee (at issue)
United States Filter Corporation
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.