Granted Patent
Utility
US 5,252,243 · App. 07/462,919
Carpet cleaning method
Inventor:
Charles R. Minns
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Jan 8, 1990
Inventor
Charles R. Minns
Assignee (at issue)
BASF SE
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.