Granted Patent
Utility
US 4,702,845 · App. 06/826,806
Rotary drum filter
Inventor:
Richard H. Wykoff
Patented Case
View Patent ↗
Granted: Oct 27, 1987
Filed: Feb 6, 1986
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.