Granted Patent
Utility
US 5,477,580 · App. 08/312,456
Grout brush for a rotary floor machine
Inventor:
Jeffery T. Buysse
Patented Case
View Patent ↗
Granted: Dec 26, 1995
Filed: Sep 26, 1994
Inventor
Jeffery T. Buysse
Assignee (at issue)
Clarke Industries, 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.