EC CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5283731 Computer-based classified ad system and methodExpiredDec 23, 92Feb 01, 94[H04M, G06F, G06G]
4658416 Automatic call transfer system capable of carrying out call transfer without manual operationExpiredFeb 11, 85Apr 14, 87[H04Q]
4519660 Electrical connectors with quasi-terminal pinsExpiredMar 15, 84May 28, 85[H01R]

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