Granted Patent
Utility
US 4,155,841 · App. 05/780,025
High turbulence screen
Inventors:
David E. Chupka, Peter Seifert
Patented Case
View Patent ↗
Granted: May 22, 1979
Filed: Mar 22, 1977
Inventors
David E. Chupka
Peter Seifert
Assignee (at issue)
Black Clawson Company, Inc.
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.