Granted Patent
Utility
US 4,901,417 · App. 07/176,500
Method of finishing screen plates
Inventors:
David E. Chupka, Carl C. Landegger
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Apr 1, 1988
Inventors
David E. Chupka
Carl C. Landegger
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.