Atalla Technovations

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4357529 Multilevel security apparatus and methodExpiredNov 17, 80Nov 02, 82[G06K]
4328414 Multilevel security apparatus and methodExpiredDec 11, 79May 04, 82[G06K]
4315101 Method and apparatus for securing data transmissionsExpiredOct 09, 79Feb 09, 82[H04L, H04Q, G06F]
4304990 Multilevel security apparatus and methodExpiredFeb 04, 80Dec 08, 81[G06K]
4288659 Method and means for securing the distribution of encoding keysExpiredMay 21, 79Sep 08, 81[H04L]
4283599 Method and apparatus for securing data transmissionsExpiredFeb 05, 79Aug 11, 81[H04L]
4281215 Method and apparatus for securing data transmissionsExpiredMay 03, 78Jul 28, 81[H04L]
4268715 Method and apparatus for securing data transmissionsExpiredJan 16, 79May 19, 81[H04L]
4198619 Programmable security system and methodExpiredFeb 21, 78Apr 15, 80[G05B, G07F]

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