Granted Patent
Utility
US 4,622,144 · App. 06/622,976
Pressure filter apparatus
Inventors:
Louis Janecek, Richard H. Wykoff
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Jun 21, 1984
Inventors
Louis Janecek
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.