TELTONE CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2002/0181,691 PBX remote telephone control systemABANMay 21, 02Dec 05, 02[H04M]
2002/0122,417 Selection of voice connection typeABANFeb 28, 02Sep 05, 02[H04L]
5,563,938 Subscriber telephone diverter switchExpiredApr 07, 95Oct 08, 96[H04M]
5,239,570 9-1-1 Switched access systemExpiredJul 25, 90Aug 24, 93[H04M]
4,412,299 Phase jitter detectorExpiredFeb 02, 81Oct 25, 83[G01R, H04M]
4,330,687 Audio and full duplex digital data carrier systemExpiredMar 14, 79May 18, 82[H04H, H04M]
4,302,629 Digital data transmission systemExpiredAug 01, 79Nov 24, 81[H04M]
4,214,130 Signal couplerExpiredMar 10, 78Jul 22, 80[H04M]

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