Granted Patent
Utility
US 5,389,278 · App. 07/901,467
Method for removing coffee stains from carpet
Inventors:
Charles R. Minns, Thomas L. Varner, Jr.
Patented Case
View Patent ↗
Granted: Feb 14, 1995
Filed: Jun 19, 1992
Inventors
Charles R. Minns
Thomas L. Varner, Jr.
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.