Granted Patent
Utility
US 5,956,400 · App. 08/684,263
Partitioned information storage systems with controlled retrieval
Inventors:
David Chaum, Niels T. Ferguson, Berry Schoenmakers, Erik Voskuil
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Jul 19, 1996
Inventors
David Chaum
Niels T. Ferguson
Berry Schoenmakers
Erik Voskuil
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.