Madge Networks Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6351725 Interface apparatusExpiredJul 18, 95Feb 26, 02[G06F]
6275549 Methods and apparatus for synchronizing a clockExpiredMar 10, 97Aug 14, 01[H04L]
6201816 Token ring speed detectionExpiredMay 07, 97Mar 13, 01[H04L]
6172964 Clock synchronizationExpiredDec 31, 96Jan 09, 01[H04J]
6018518 Flow control in a cell switched communication systemExpiredJan 10, 97Jan 25, 00[H04L, H04J]
5991295 Digital switchExpiredOct 07, 96Nov 23, 99[H04L]
5926048 Method and apparatus for synchronizing clock signalsExpiredMar 25, 97Jul 20, 99[H03L]
5805598 End station portExpiredAug 27, 96Sep 08, 98[H04L, H04J]
5754551 Ring communication system and method for connecting a plurality of end stationsExpiredJul 07, 95May 19, 98[H04L]
5710777 Communication systemExpiredFeb 05, 93Jan 20, 98[G01R]
5659273 Line termination for multiple differential transmission linesExpiredAug 01, 95Aug 19, 97[H01P]
5548280 Local area network hub unitExpiredMay 11, 94Aug 20, 96[H04Q]
5541853 Processor configurable for both virtual mode and protected modeExpiredJun 08, 94Jul 30, 96[G06F]
5515404 Data communication systemsExpiredJun 23, 94May 07, 96[H04L]
5459440 Automatic impedance matching with potential monitoring meansExpiredApr 18, 94Oct 17, 95[H03H]
5436624 Communication system with monitoring means connected in parallel to signal carrying mediumExpiredJan 21, 93Jul 25, 95[G05B, H04J]
4985888 Token ring system hierarchyExpiredDec 14, 89Jan 15, 91[H04J]
4905230 Token ring expander and/or hubExpiredApr 05, 88Feb 27, 90[H04J]

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