Granted Patent
Utility
US 4,661,251 · App. 06/806,484
Filter unit with filter media arrangement for engagement with conveyor flights
Inventor:
Richard H. Wykoff
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Dec 9, 1985
Inventor
Richard H. Wykoff
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.