Granted Patent
Utility
US 5,712,913 · App. 08/193,500
Limited-traceability systems
Inventor:
David Chaum
Patented Case
View Patent ↗
Granted: Jan 27, 1998
Filed: Feb 8, 1994
Inventor
David Chaum
Assignee (at issue)
DigiCash Incorporated
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.