Granted Patent
Utility
US 6,740,144 · App. 10/043,337
Vacuum cleaner utilizing electrostatic filtration and electrostatic precipitator for use therein
Inventors:
Wayne Ernest Conrad, Helmut Gerhard Conrad
Patented Case
View Patent ↗
Granted: May 25, 2004
Filed: Jan 14, 2002
Inventors
Wayne Ernest Conrad
Helmut Gerhard Conrad
Assignee (at issue)
Fantom Technologies 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.