Granted Patent
Utility
US 4,289,839 · App. 06/121,883
Negative image diazography formulation with acid labile coupler, diazonium compound and carboxylic acid anhydride
Inventor:
Carmine A. DiPippo
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Feb 15, 1980
Inventor
Carmine A. DiPippo
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.