Granted Patent
Utility
US 6,532,621 · App. 09/759,437
Vacuum cleaner with noise suppression features
Inventors:
Paul D. Stephens, Jeffrey M. Kalman, Steven J. Paliobeis, Charles J. Thur
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Jan 12, 2001
Inventors
Paul D. Stephens
Jeffrey M. Kalman
Steven J. Paliobeis
Charles J. Thur
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.