Granted Patent
Utility
US 5,659,921 · App. 08/589,613
Sweeper with double side skirts for dust control
Inventor:
Nilabh Narayan
Patented Case
View Patent ↗
Granted: Aug 26, 1997
Filed: Jan 22, 1996
Inventor
Nilabh Narayan
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.