Granted Patent
Utility
US 6,131,237 · App. 09/133,832
Upright extraction cleaning machine
Inventors:
Gary A. Kasper, David E. McDowell, Eric J. Hansen
Patented Case
View Patent ↗
Granted: Oct 17, 2000
Filed: Aug 13, 1998
Inventors
Gary A. Kasper
David E. McDowell
Eric J. Hansen
Assignee (at issue)
BISSELL Homecare, 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.