Granted Patent
Utility
US 4,654,920 · App. 06/843,526
Sponge mop with scrubber attachment
Inventors:
William J. O'Neil, Richard P. Burkhart
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Mar 24, 1986
Inventors
William J. O'Neil
Richard P. Burkhart
Assignee (at issue)
The Drackett 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.