Granted Patent
Utility
US 6,463,622 · App. 09/900,557
Upright vacuum cleaner with cyclonic airflow
Inventors:
Michael F. Wright, Charles J. Thur, Brett Latimer, Paul D. Stephens, Mark E. Cipolla, Craig Barbeck
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: Jul 6, 2001
Inventors
Michael F. Wright
Charles J. Thur
Brett Latimer
Paul D. Stephens
Mark E. Cipolla
Craig Barbeck
Assignee (at issue)
Royal Appliance Mfg., Co.
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.