Granted Patent
Utility
US 4,304,182 · App. 06/186,601
No-lock printing plate assembly using flexible plates
Inventors:
Gordon Etchell, Cyril W. Frank
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Sep 12, 1980
Inventors
Gordon Etchell
Cyril W. Frank
Assignee (at issue)
Pathfinder Graphic Associates 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.