Granted Patent
Utility
US 5,901,407 · App. 08/856,787
Scrubbing machine with means for continuously cleaning a filter
Inventor:
Steven L. Boomgaarden
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: May 15, 1997
Inventor
Steven L. Boomgaarden
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.