Granted Patent
Utility
US 4,914,698 · App. 07/384,092
One-show blind signature systems
Inventor:
David Chaum
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Jul 24, 1989
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.