Network Access Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5416780 Telecommunications system and protocol for avoiding message collisions on a multiplexed communications linkExpiredApr 16, 92May 16, 95[H04J]
5315636 Personal telecommunications systemExpiredJun 28, 91May 24, 94[H04M]
5233643 Method and system network for providing an area with limited bandwidth bi-direction burst personnel telecommunicationsExpiredOct 08, 91Aug 03, 93[H04J]
5086461 Apparatus and method for providing existing 1ESS and 1AESS telephone switching equipment with the capability of using the SS7 protocolExpiredJan 23, 90Feb 04, 92[H04M]
4903263 Apparatus and method for providing existing telephone switching equipment with integrated services digital network capabilityExpiredOct 03, 88Feb 20, 90[H04Q, H04J]
4853955 Apparatus and method for providing existing telephone switching equipment with the capability of using the SS7 protocolExpiredApr 27, 88Aug 01, 89[H04M]
4782519 Method and apparatus for enhancing the operating capabilities of a telephone switching systemExpiredMay 22, 86Nov 01, 88[H04Q]

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