Granted Patent
Utility
US 6,735,811 · App. 10/143,582
Cleaning liquid dispensing system for a hard floor surface cleaner
Inventors:
Bruce F. Field, Joseph K. Krueger, Bryan Christensen, Richard Mark Pierce, James J. Seifert
Patented Case
View Patent ↗
Granted: May 18, 2004
Filed: May 9, 2002
Inventors
Bruce F. Field
Joseph K. Krueger
Bryan Christensen
Richard Mark Pierce
James J. Seifert
Assignee (at issue)
TENNANT COMPANY
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.