Granted Patent
Utility
US 6,449,793 · App. 09/952,130
Tessellated cylindrical brush
Inventors:
Joseph F. D'Costa, Michael T. Basham, Warren L. Larson
Patented Case
View Patent ↗
Granted: Sep 17, 2002
Filed: Sep 10, 2001
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.