Granted Patent
Utility
US 4,464,810 · App. 06/401,069
Scrubbing machine with liquid recirculation
Inventor:
David J. Karpanty
Patented Case
View Patent ↗
Granted: Aug 14, 1984
Filed: Jul 23, 1982
Inventor
David J. Karpanty
Assignee (at issue)
The Scott Fetzer 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.