Granted Patent
Utility
US 4,213,887 · App. 06/058,235
Lithographic plate finisher
Inventors:
John E. Walls, Thomas N. Gillich
Patented Case
View Patent ↗
Granted: Jul 22, 1980
Filed: Jul 16, 1979
Inventors
John E. Walls
Thomas N. Gillich
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.