Assignee
HITACHI TELECOMM TECH
JP·55 granted patents·495 citations·filing 1985–2004
Top patents by PatentIndex Score
55 records- 0194US4736405ACommunication system with operation-procedure guiding function by speechHITACHI TELECOMM TECH·Filed 1985·Granted Apr 5, 1988·193 cites·17 claims
- 0273US6822962B1Virtual connection switching method and ATM switchHITACHI TELECOMM TECH·Filed 2000·Granted Nov 23, 2004·32 cites·8 claims
- 0365US6122292ADynamic band allocation systemHITACHI TELECOMM TECH·Filed 1998·Granted Sep 19, 2000·41 cites·3 claims
- 0463US7062033B2DTMF signal transmission method and communication apparatusHITACHI TELECOMM TECH·Filed 2004·Granted Jun 13, 2006·5 cites·8 claims
- 0561US7532606B2DTMF signal transmission method and communication apparatusHITACHI TELECOMM TECH·Filed 2004·Granted May 12, 2009·4 cites·8 claims
- 0660US7120171B2Packet data processing apparatus and packet data processing methodHITACHI TELECOMM TECH·Filed 2002·Granted Oct 10, 2006·6 cites·7 claims
- 0758US5471525ALine status display system for telephone exchange systemHITACHI TELECOMM TECH·Filed 1994·Granted Nov 28, 1995·38 cites·9 claims
- 0855US6487279B1Telephone terminal and telephone exchange system accommodating the terminalHITACHI TELECOMM TECH·Filed 2000·Granted Nov 26, 2002·4 cites·6 claims
- 0953US6892232B2Local networking system for registering unregistered terminalsHITACHI TELECOMM TECH·Filed 2001·Granted May 10, 2005·2 cites·12 claims
- 1052US7103036B2Voice data relay apparatusHITACHI TELECOMM TECH·Filed 2001·Granted Sep 5, 2006·2 cites·6 claims
- 1151US7058060B2ATM apparatus, IP apparatus and bus systemHITACHI TELECOMM TECH·Filed 2001·Granted Jun 6, 2006·6 cites·5 claims
- 1251US7050570B2DTMF signal transmission method and communication apparatusHITACHI TELECOMM TECH·Filed 2004·Granted May 23, 2006·1 cites·20 claims
- 1351US7035265B2Multiplexer and priority control method for packet data transmissionsHITACHI TELECOMM TECH·Filed 2001·Granted Apr 25, 2006·4 cites·4 claims
- 1449US6970460B2Multiplexing apparatusHITACHI TELECOMM TECH·Filed 2001·Granted Nov 29, 2005·2 cites·5 claims
- 1547US7099456B2Call center systemHITACHI TELECOMM TECH·Filed 2002·Granted Aug 29, 2006·6 cites·14 claims
- 1646US6810014B1ATM multiplex apparatus and congestion reporting methodHITACHI TELECOMM TECH·Filed 2000·Granted Oct 26, 2004·2 cites·3 claims
- 1746US5602722AElectric appliance, its assembling method, and its housing structureHITACHI TELECOMM TECH·Filed 1995·Granted Feb 11, 1997·8 cites·6 claims
- 1844US5754642ATelephone terminal having multiple handsetsHITACHI TELECOMM TECH·Filed 1997·Granted May 19, 1998·8 cites·21 claims
- 1944US5461377APanel unit of dealing boardHITACHI TELECOMM TECH·Filed 1994·Granted Oct 24, 1995·8 cites·2 claims
- 2039US6898178B2ATM device, subscriber system, communication system and backup methodHITACHI TELECOMM TECH·Filed 2001·Granted May 24, 2005·0 cites·10 claims
- 2139US5905551AElectric appliance, its assembling method, and its housing structureHITACHI TELECOMM TECH·Filed 1997·Granted May 18, 1999·5 cites·5 claims
- 2238US5465292ATrading telephoneHITACHI TELECOMM TECH·Filed 1993·Granted Nov 7, 1995·10 cites·20 claims
- 2338US5461376APanel unit of dealing boardHITACHI TELECOMM TECH·Filed 1994·Granted Oct 24, 1995·6 cites·4 claims
- 2437US7050438B1Cell creation method for control line signals of ATM Network and multiplexing equipmentHITACHI TELECOMM TECH·Filed 2000·Granted May 23, 2006·0 cites·10 claims
- 2536US6345054B1Cell relay communication method, cell relay communication system and cell relay communication equipmentHITACHI TELECOMM TECH·Filed 1998·Granted Feb 5, 2002·10 cites·3 claims
- 2636US5651061ATelephone exchange systemHITACHI TELECOMM TECH·Filed 1995·Granted Jul 22, 1997·4 cites·52 claims
- 2736US5461543AElectric appliance, its assembling method, and its housing structureHITACHI TELECOMM TECH·Filed 1993·Granted Oct 24, 1995·3 cites·19 claims
- 2835US6772373B2Disorder detecting deviceHITACHI TELECOMM TECH·Filed 2001·Granted Aug 3, 2004·2 cites·8 claims
- 2935US6700973B1System for transmitting DTMF signal and communication equipment thereofHITACHI TELECOMM TECH·Filed 1999·Granted Mar 2, 2004·4 cites·14 claims
- 3035US6647104B1Speech system, extension communication terminal, and method of up-loading data for communication systemHITACHI TELECOMM TECH·Filed 1999·Granted Nov 11, 2003·4 cites·6 claims
- 3135US6031824AMaintenance and supervisory control method and system for multiplex communication equipmentHITACHI TELECOMM TECH·Filed 1997·Granted Feb 29, 2000·4 cites·8 claims
- 3234US5987039AMultiplexing system for ISDN circuitsHITACHI TELECOMM TECH·Filed 1996·Granted Nov 16, 1999·4 cites·5 claims
- 3334US5838402AElectric appliance, its assembling method, and its housing structureHITACHI TELECOMM TECH·Filed 1996·Granted Nov 17, 1998·3 cites·2 claims
- 3433US6507578B1Channel division control equipment of the ISDN primary rate interface circuitHITACHI TELECOMM TECH·Filed 2000·Granted Jan 14, 2003·0 cites·3 claims
- 3533US5594625AElectric appliance, its assembling method, and its housing structureHITACHI TELECOMM TECH·Filed 1995·Granted Jan 14, 1997·2 cites·19 claims
- 3633US5581446AHousing structure of electric appliance and disassembling method thereofHITACHI TELECOMM TECH·Filed 1995·Granted Dec 3, 1996·5 cites·5 claims
- 3733US5404398ATelephone exchange systemHITACHI TELECOMM TECH·Filed 1993·Granted Apr 4, 1995·5 cites·17 claims
- 3832US6714640B1Communication system, exchange and extension call processing methodHITACHI TELECOMM TECH·Filed 1999·Granted Mar 30, 2004·1 cites·6 claims
- 3932US5953313ACircuit switching control method for multiplex communication equipmentHITACHI TELECOMM TECH·Filed 1997·Granted Sep 14, 1999·3 cites·1 claims
- 4031US6836545B1Communication system, exchange and communication holding control methodHITACHI TELECOMM TECH·Filed 1999·Granted Dec 28, 2004·2 cites·4 claims
- 4131US5999516AMultiplex communication equipment and communication test method thereofHITACHI TELECOMM TECH·Filed 1997·Granted Dec 7, 1999·4 cites·3 claims
- 4231US5418850ADealing boardHITACHI TELECOMM TECH·Filed 1993·Granted May 23, 1995·5 cites·1 claims
- 4330US6141343AChannel division control equipment of the ISDN primary rate interface circuitHITACHI TELECOMM TECH·Filed 1996·Granted Oct 31, 2000·5 cites·6 claims
- 4429US6263000B1Remote trading call terminals in a trading call systemHITACHI TELECOMM TECH·Filed 1996·Granted Jul 17, 2001·4 cites·3 claims
- 4528US6646712B1Command system for performing centralized management of data in a command deskHITACHI TELECOMM TECH·Filed 1999·Granted Nov 11, 2003·0 cites·9 claims
- 4627US6862290B1Line switching system and line switching unit of dynamic band variation unitHITACHI TELECOMM TECH·Filed 1999·Granted Mar 1, 2005·0 cites·2 claims
- 4727US6215794B1Multiple band change-over method for multiplex communication equipmentHITACHI TELECOMM TECH·Filed 1997·Granted Apr 10, 2001·0 cites·4 claims
- 4827US5661793AKey unitHITACHI TELECOMM TECH·Filed 1995·Granted Aug 26, 1997·2 cites·15 claims
- 4926US6192047B1Time division multiple equipmentHITACHI TELECOMM TECH·Filed 1998·Granted Feb 20, 2001·6 cites·12 claims
- 5026US5666409ADealing boardHITACHI TELECOMM TECH·Filed 1995·Granted Sep 9, 1997·1 cites·4 claims
Showing the top 50 of 55 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when HITACHI TELECOMM TECH files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →