Granted Patent
Utility
US 4,308,340 · App. 06/176,363
Aqueous 2-propoxyethanol containing processing composition for lithographic printing plates
Inventor:
John E. Walls
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Aug 8, 1980
Inventor
John E. Walls
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.