Granted Patent
Utility
US 4,383,918 · App. 06/145,654
High turbulence screen
Inventors:
David E. Chupka, Peter Seifert
Patented Case
View Patent ↗
Granted: May 17, 1983
Filed: May 2, 1980
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.