Granted Patent
Utility
US 4,339,525 · App. 06/108,840
Color proofing system using dot-etchable photopolymerizable elements
Inventors:
Martin D. Bratt, Abraham B. Cohen
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Dec 31, 1979
Inventors
Martin D. Bratt
Abraham B. Cohen
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.