Granted Patent
Utility
US 6,481,048 · App. 09/596,232
Three tank carpet spotter
Inventors:
Douglas Hauff, Dennis Duerr, Steven Graham Williams
Patented Case
View Patent ↗
Granted: Nov 19, 2002
Filed: Jun 13, 2000
Inventors
Douglas Hauff
Dennis Duerr
Steven Graham Williams
Assignee (at issue)
Palouse Holdings, LLC
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.