Assignee
AT & T CO
US·26 granted patents·2,238 citations·filing 1984–1989
Top patents by PatentIndex Score
26 records- 0199US4943973ASpread-spectrum identification signal for communications systemAT & T CO·Filed 1989·Granted Jul 24, 1990·379 cites·23 claims
- 0296US4935954AAutomated message retrieval systemAT & T CO·Filed 1988·Granted Jun 19, 1990·376 cites·16 claims
- 0395US4953198APublic cordless telephoneAT & T CO·Filed 1989·Granted Aug 28, 1990·188 cites·18 claims
- 0492US4669113AIntegrated network controller for a dynamic nonhierarchical routing switching networkAT & T CO·Filed 1985·Granted May 26, 1987·203 cites·16 claims
- 0589US4661974AAutomatic route selection of a private telephone network path on the basis of a public telephone network numberAT & T CO·Filed 1984·Granted Apr 28, 1987·78 cites·31 claims
- 0689US4652733ATechnique for cataloging pictorial and/or written database information on video tape or diskAT & T CO·Filed 1984·Granted Mar 24, 1987·35 cites·6 claims
- 0789US4644562ACombined cross polarization interference cancellation and intersymbol interference equalization for terrestrial digital radio systemsAT & T CO·Filed 1985·Granted Feb 17, 1987·123 cites·5 claims
- 0887US4661993ATechnique for improving radio system performance during fadingAT & T CO·Filed 1984·Granted Apr 28, 1987·59 cites·19 claims
- 0987US4653085ATelephone switching system adjunct call processing arrangementAT & T CO·Filed 1984·Granted Mar 24, 1987·74 cites·13 claims
- 1086US4939509AData conferencing arrangement for stations having keyboards and displays, using a keyboard buffer and a screen bufferAT & T CO·Filed 1988·Granted Jul 3, 1990·130 cites·15 claims
- 1185US4933967AAutomatically-effected move of a subscriber between electronic message service systems in a networkAT & T CO·Filed 1989·Granted Jun 12, 1990·132 cites·27 claims
- 1280US4939752ADistributed timing recovery for a distributed communication systemAT & T CO·Filed 1989·Granted Jul 3, 1990·78 cites·23 claims
- 1379US4677616AFlow control scheme for a switching networkAT & T CO·Filed 1985·Granted Jun 30, 1987·64 cites·19 claims
- 1475US4656627AMultiphase packet switching systemAT & T CO·Filed 1984·Granted Apr 7, 1987·36 cites·22 claims
- 1574US4646346AIntegrated message service systemAT & T CO·Filed 1985·Granted Feb 24, 1987·55 cites·17 claims
- 1672US4682354AAutomatic call coverage for unattended PBX stationsAT & T CO·Filed 1984·Granted Jul 21, 1987·21 cites·22 claims
- 1768US4658260ATelescoping multiband antennaAT & T CO·Filed 1985·Granted Apr 14, 1987·30 cites·15 claims
- 1868US4651103APhase adjustment systemAT & T CO·Filed 1985·Granted Mar 17, 1987·32 cites·9 claims
- 1968US4643521APlural-channel optical rotary jointAT & T CO·Filed 1984·Granted Feb 17, 1987·24 cites·11 claims
- 2062US4641299AMechanized loop testing using a local metallic access portAT & T CO·Filed 1984·Granted Feb 3, 1987·15 cites·14 claims
- 2161US4672654APBX security system for monitoring security guard toursAT & T CO·Filed 1984·Granted Jun 9, 1987·31 cites·13 claims
- 2251US4680786ACommunication system for providing business communication features to cellular mobile telecommunication customersAT & T CO·Filed 1985·Granted Jul 14, 1987·54 cites·14 claims
- 2350US4665547ALimiting amplifier for common mode feedback in telephone line feed circuitsAT & T CO·Filed 1984·Granted May 12, 1987·9 cites·6 claims
- 2429US4658421ATelephone set standAT & T CO·Filed 1985·Granted Apr 14, 1987·4 cites·21 claims
- 2528US4663583AAutomatically variable phase characteristic all-pass circuitAT & T CO·Filed 1986·Granted May 5, 1987·4 cites·5 claims
- 2627US4663519AWound coil products and manufacture thereofAT & T CO·Filed 1985·Granted May 5, 1987·4 cites·17 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →