Granted Patent
Utility
US 4,646,862 · App. 06/767,878
Floor cleaning machine
Inventor:
Hermann Meili
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Aug 21, 1985
Inventor
Hermann Meili
Assignee (at issue)
Internationale Octropi
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.