Granted Patent
Utility
US 6,401,295 · App. 09/818,431
Upright vacuum cleaner with cyclonic air flow
Inventors:
Kenneth W. Bair, Richard C. Gibbs, Mark Reindle, Michael F. Wright
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Mar 27, 2001
Inventors
Kenneth W. Bair
Richard C. Gibbs
Mark Reindle
Michael F. Wright
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.