Granted Patent
Utility
US 6,578,858 · App. 09/956,068
Floor surface treatment apparatus with dolly
Inventor:
John Haddock
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Sep 19, 2001
Inventor
John Haddock
Assignee (at issue)
Alto U.S. Inc.
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.