Granted Patent
Utility
US 5,434,919 · App. 08/179,962
Compact endorsement signature systems
Inventor:
David Chaum
Patented Case
View Patent ↗
Granted: Jul 18, 1995
Filed: Jan 11, 1994
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.