Granted Patent
Utility
US 6,494,940 · App. 09/676,322
Air purifier
Inventor:
Marron Hak
Patented Case
View Patent ↗
Granted: Dec 17, 2002
Filed: Sep 29, 2000
Inventor
Marron Hak
Assignee (at issue)
Hamilton Beach/Proctor Silex, Inc.
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.