Granted Patent
Utility
US 4,236,269 · App. 06/035,393
Vertical axis brush
Inventor:
Thomas S. Block
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: May 2, 1979
Inventor
Thomas S. Block
Assignee (at issue)
Clarke-Gravely Corporation
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.