Granted Patent
Utility
US 6,530,821 · App. 09/850,688
Battery powered, riding, floor burnishing machine
Inventors:
Donald Joseph Legatt, Kipp Knutson
Patented Case
View Patent ↗
Granted: Mar 11, 2003
Filed: May 7, 2001
Inventors
Donald Joseph Legatt
Kipp Knutson
Assignee (at issue)
Nilfisk-Advance, 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.