Granted Patent
Utility
US 4,882,474 · App. 07/153,294
Security file system and method for securing data in a portable data carrier
Inventors:
Ewald C. Anderl, Oren Frankel, Avi Zahavi
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Feb 5, 1988
Inventors
Ewald C. Anderl
Oren Frankel
Avi Zahavi
Assignees (at issue)
American Telephone and Telegraph, Co.
AT&T Information Systems Inc.
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.