Granted Patent
Utility
US 5,276,736 · App. 07/912,193
Optionally moderated transaction systems
Inventor:
David Chaum
Patented Case
View Patent ↗
Granted: Jan 4, 1994
Filed: Jul 13, 1992
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.