Granted Patent
Utility
US 4,469,772 · App. 06/458,408
Water developable dye coating on substrate with two diazo polycondensation products and water soluble polymeric binder
Inventors:
Oliver A. Barton, James D. Wright
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Jan 17, 1983
Inventors
Oliver A. Barton
James D. Wright
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.