Granted Patent
Utility
US 6,535,997 · App. 09/315,093
Data integrity in smartcard transactions
Inventors:
Philippe A. Janson, Helmut Scherzer
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: May 19, 1999
Inventors
Philippe A. Janson
Helmut Scherzer
Assignee (at issue)
International Business Machines Corporation
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.