Granted Patent
Utility
US 6,171,481 · App. 09/269,429
Water purifier
Inventor:
Stefan Walfridsson
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Mar 26, 1999
Inventor
Stefan Walfridsson
Assignee (at issue)
Aktiebolaget Electrolux
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.