Inventor
FRANKEL OREN
US3 patents
Patents
3 patentsUS4882474ANov 21, 1989
Security file system and method for securing data in a portable data carrier
AMERICAN TELEPHONE & TELEGRAPH252 citations97
US4816653AMar 28, 1989
Security file system for a portable data carrier
AMERICAN TELEPHONE & TELEGRAPH250 citations97
US4816654AMar 28, 1989
Improved security system for a portable data carrier
AMERICAN TELEPHONE & TELEGRAPH161 citations97