Granted Patent
Utility
US 4,596,757 · App. 06/720,468
Photopolymerizable dual transfer negative working color proofing system
Inventors:
Oliver A. Barton, James D. Wright
Patented Case
View Patent ↗
Granted: Jun 24, 1986
Filed: Apr 5, 1985
Inventors
Oliver A. Barton
James D. Wright
Assignee (at issue)
American Hoechst Corporation
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.