Granted Patent
Utility
US 5,373,558 · App. 08/066,669
Desinated-confirmer signature systems
Inventor:
David Chaum
Patented Case
View Patent ↗
Granted: Dec 13, 1994
Filed: May 25, 1993
Inventor
David Chaum
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.