Granted Patent
Utility
US 4,396,505 · App. 06/329,178
Filtration system pump arrangement
Inventors:
David H. Willson, Thomas C. Adams
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Dec 10, 1981
Inventors
David H. Willson
Thomas C. Adams
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.