D.A.V.I.D. Systems, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4731827 Interswitch line circuitExpiredOct 29, 84Mar 15, 88[H04M]
4689816 Three relay C. O. trunk interfaceExpiredJan 15, 85Aug 25, 87[H04M]
4680779 Distributed clock synchronization in a digital data switching systemExpiredJan 14, 85Jul 14, 87[H04L]
4584690 Alternate Mark Invert (AMI) transceiver with switchable detection and digital precompensationExpiredMay 07, 84Apr 22, 86[H04L, H03K, H04B]
4579406 Printed circuit board connector systemExpiredJan 11, 85Apr 01, 86[H01R]

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