Granted Patent
Utility
US 4,805,652 · App. 07/099,119
Wash station for tanks
Inventors:
Larry D. Hartley, Duane R. Greenquist
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Sep 21, 1987
Inventors
Larry D. Hartley
Duane R. Greenquist
Assignee (at issue)
Hoover Limited
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.