Granted Patent
Utility
US 4,252,884 · App. 06/066,401
Negative-working diazotype photoreproduction
Inventor:
Everett W. Bennett
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Aug 14, 1979
Inventor
Everett W. Bennett
Assignee (at issue)
James River Graphics Limited
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.