Granted Patent
Utility
US 4,859,290 · App. 07/154,158
Printing plate precursors
Inventor:
Philip John Watkiss
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Feb 9, 1988
Inventor
Philip John Watkiss
Assignee (at issue)
Vickers PLC
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.