Granted Patent
Utility
US 6,233,775 · App. 09/367,177
Floor mopping device
Inventor:
Hans G. Franke
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Oct 22, 1999
Inventor
Hans G. Franke
Assignee (at issue)
Carl Freudenberg
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.