Granted Patent
Utility
US 4,618,562 · App. 06/686,778
Aqueous developable lithographic printing plates containing an admixture of diazonium salts and polymers and composition therefor
Inventors:
John E. Walls, Shuchen Liu
Patented Case
View Patent ↗
Granted: Oct 21, 1986
Filed: Dec 27, 1984
Inventors
John E. Walls
Shuchen Liu
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.