Granted Patent
Utility
US 6,286,169 · App. 08/789,140
Tessellated cylindrical brush
Inventors:
Joseph F. D'Costa, Michael T. Basham, Warren L. Larson
Patented Case
View Patent ↗
Granted: Sep 11, 2001
Filed: Jan 27, 1997
Inventors
Joseph F. D'Costa
Michael T. Basham
Warren L. Larson
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.