Assignee
AT & T INFORMATION SYSTEMS INC
US·76 granted patents·2,493 citations·filing 1983–1987
Top patents by PatentIndex Score
76 records- 0195US4611875ACommunication system cross-connect field power adapterAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Sep 16, 1986·124 cites·6 claims
- 0295USD279010SVideo monitorAT&T INFORMATION SYSTEMS INC·Filed 1984·Granted May 28, 1985·55 cites·1 claims
- 0394USD286285STelephone standAT&T INFORMATION SYSTEMS INC·Filed 1986·Granted Oct 21, 1986·41 cites·1 claims
- 0494US4520490ADifferentially nonlinear convolutional channel coding with expanded set of signalling alphabetsAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted May 28, 1985·113 cites·18 claims
- 0593US4716376AAdaptive FSK demodulator and threshold detectorAT & T INFORMATION SYSTEMS INC·Filed 1985·Granted Dec 29, 1987·148 cites·22 claims
- 0693USD284280SHousing for communication equipmentAT&T INFORMATION SYSTEMS INC·Filed 1985·Granted Jun 17, 1986·43 cites·1 claims
- 0790US4612416AIntegrated message service systemAT & T INFORMATION SYSTEMS INC·Filed 1985·Granted Sep 16, 1986·182 cites·19 claims
- 0889US4536052AModular cross-connect panelAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Aug 20, 1985·66 cites·21 claims
- 0988US4593282ANetwork protocol for integrating synchronous and asynchronous traffic on a common serial data busAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Jun 3, 1986·119 cites·35 claims
- 1088US4534040AMethod and apparatus for coding a binary signalAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Aug 6, 1985·73 cites·8 claims
- 1187US4483012ADifferentially convolutional channel coding with expanded set of signalling alphabetsAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Nov 13, 1984·63 cites·6 claims
- 1285US4615038AEqualization of modulated data signals utilizing tentative and final decisions and replication of non-linear channel distortionAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Sep 30, 1986·75 cites·15 claims
- 1384US4630196AStore and forward facility for use in multiprocessing environmentAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Dec 16, 1986·102 cites·16 claims
- 1482US4631534ADistributed packet switching systemAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Dec 23, 1986·52 cites·10 claims
- 1581US4628992AInduced flow heat exchangerAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Dec 16, 1986·39 cites·12 claims
- 1681USD285795SCommunication equipment coverAT&T INFORMATION SYSTEMS INC·Filed 1985·Granted Sep 23, 1986·20 cites·1 claims
- 1781US4480178ATuning arrangement for interfacing credit card-like device to a reader systemAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Oct 30, 1984·64 cites·16 claims
- 1880US4862498AMethod and apparatus for automatically selecting system commands for displayAT & T INFORMATION SYSTEMS INC·Filed 1986·Granted Aug 29, 1989·70 cites·9 claims
- 1980US4617663AInterface testing of software systemsAT & T INFORMATION SYSTEMS INC·Filed 1985·Granted Oct 14, 1986·80 cites·15 claims
- 2079US4583182AControllable risk parameter for device control systemAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Apr 15, 1986·60 cites·6 claims
- 2179US4568801ATelephone desk stand/wall mounting apparatusAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Feb 4, 1986·37 cites·9 claims
- 2277US4535445AConferencing system adaptive signal conditionerAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Aug 13, 1985·33 cites·15 claims
- 2376US4633041AStation set directory assistance arrangementAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Dec 30, 1986·34 cites·18 claims
- 2475US4582959AMessage waiting alerting methodAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Apr 15, 1986·25 cites·5 claims
- 2575US4511969AControl channel interface circuitAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Apr 16, 1985·27 cites·21 claims
- 2674US4600812ACommunication system having abbreviated dialing accessAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Jul 15, 1986·45 cites·9 claims
- 2773US4640032AWire and cable organizing sleeveAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Feb 3, 1987·32 cites·2 claims
- 2872US4538030AMethod and apparatus for establishing telephone calling costsAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Aug 27, 1985·33 cites·13 claims
- 2970US4658333AVariable length backplane busAT & T INFORMATION SYSTEMS INC·Filed 1985·Granted Apr 14, 1987·42 cites·3 claims
- 3070US4649468AVoltage divider circuitAT & T INFORMATION SYSTEMS INC·Filed 1985·Granted Mar 10, 1987·28 cites·7 claims
- 3170US4516250AFrequency and phase comparator with slip detection capabilityAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted May 7, 1985·20 cites·24 claims
- 3269US4642424ACryptographic transmission systemAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Feb 10, 1987·26 cites·37 claims
- 3369USD285306SPublic access data processor controlled information terminalAT&T INFORMATION SYSTEMS INC·Filed 1985·Granted Aug 26, 1986·13 cites·1 claims
- 3469US4599719AFull duplex data set with half-duplex emulationAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Jul 8, 1986·34 cites·2 claims
- 3568US4577068AAdaptive modular telephone cradle for a communication terminalAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Mar 18, 1986·17 cites·8 claims
- 3666US4512017ADigital dual channel communication terminalAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Apr 16, 1985·16 cites·10 claims
- 3765US4512016ADigital communication station signaling controlAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Apr 16, 1985·16 cites·12 claims
- 3864US4629832ACommunication system administration method and circuitryAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Dec 16, 1986·19 cites·20 claims
- 3964US4538782AElectrical cable supporting clampAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Sep 3, 1985·24 cites·1 claims
- 4063US4640992ASpeech response interface circuitAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Feb 3, 1987·13 cites·31 claims
- 4163US4612414ASecure voice transmissionAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Sep 16, 1986·15 cites·30 claims
- 4263US4534023APlural communication channel protocol support systemsAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Aug 6, 1985·13 cites·27 claims
- 4361US4959852ATelephone answering machine having solid state and magnetic tape storage for outgoing announcementsAT & T INFORMATION SYSTEMS INC·Filed 1987·Granted Sep 25, 1990·23 cites·16 claims
- 4460US4594479AFast start-up of adaptive echo canceler or echo measurement deviceAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Jun 10, 1986·19 cites·18 claims
- 4559US4508937AMethod and circuitry for encoding telephone ringing signalsAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Apr 2, 1985·20 cites·12 claims
- 4658US4639781ADynamic gain adjuster for an image scannerAT & T INFORMATION SYSTEMS INC·Filed 1985·Granted Jan 27, 1987·19 cites·12 claims
- 4758USD283894SDoor for a data processor cabinet or the likeAT&T INFORMATION SYSTEMS INC·Filed 1984·Granted May 20, 1986·10 cites·1 claims
- 4857US4593272ACommunication system power arrangementAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Jun 3, 1986·11 cites·14 claims
- 4957US4545053ATime slot interchangerAT & T INFORMATION SYSTEMS INC·Filed 1984·Granted Oct 1, 1985·11 cites·36 claims
- 5055US4532377AData call transferAT & T INFORMATION SYSTEMS INC·Filed 1983·Granted Jul 30, 1985·12 cites·18 claims
Showing the top 50 of 76 patent records by PatentIndex Score.
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