GPT INTERNATIONAL LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4759017 Telecommunications exchange allocating variable channel bandwidthExpiredMay 29, 86Jul 19, 88[H04J]
4750201 Credit transaction arrangementsExpiredAug 29, 86Jun 07, 88[H04M]
4731831 Telephone instrumentExpiredSep 19, 86Mar 15, 88[H04M]
4718754 Optical line simulatorExpiredMay 06, 86Jan 12, 88[G01N, G02B]
4654870 Telephone key systems and key stations thereforExpiredMay 13, 85Mar 31, 87[H04M]
4573485 Coin runway with coin sequencing facilityExpiredFeb 14, 83Mar 04, 86[G07D]
4569040 Electronic switching system having a time division multiplex switch controller address by central control unitExpiredJan 17, 84Feb 04, 86[H04Q, H04J]
4564938 Digital electronic switching systemsExpiredSep 14, 83Jan 14, 86[H04Q]
4493030 Plural data processor groups controlling a telecommunications exchangeExpiredMay 19, 82Jan 08, 85[G06F]
4436196 Method of and apparatus for assessing coinsExpiredJun 18, 81Mar 13, 84[G07F]
4355211 Push button key modulesExpiredFeb 10, 81Oct 19, 82[H04M]
4337461 Volume control mechanism for a bell assemblyExpiredJul 07, 80Jun 29, 82[G10K]
4312561 Optical fibre switchesExpiredOct 11, 79Jan 26, 82[G02B]
4312563 Connectors for sealed containersExpiredFeb 19, 80Jan 26, 82[G02B]
4289939 Longitudinal balance arrangements for two-to-four wire telecommunication line circuitsExpiredDec 28, 79Sep 15, 81[H04M]
4258357 Alarm signalling systemsExpiredJun 22, 79Mar 24, 81[G08B]

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