Inventor · disambiguated record
Nobukazu Koizumi
Also filed as: KOIZUMI NOBUKAZU
47 granted patents·7 pending applications·826 citations·filing 1992–2023
98Inventor score
Top patents by PatentIndex Score
54 records- 0193US6735244B1Data transmission system and receiver unit thereofFUJITSU LTD·Filed 2000·Granted May 11, 2004·114 cites·18 claims
- 0292US7423984B2Digital subscriber line transmission method, apparatus and systemFUJITSU LTD·Filed 2005·Granted Sep 9, 2008·28 cites·7 claims
- 0391US8649689B2Digital coherent receiving apparatusKOIZUMI NOBUKAZU·Filed 2010·Granted Feb 11, 2014·20 cites·7 claims
- 0491US5367540ATransversal filter for use in a digital subscriber line transmission interfaceFUJITSU LTD·Filed 1993·Granted Nov 22, 1994·102 cites·17 claims
- 0588US7167509B2Digital subscriber line communicating system and a transceiver in the systemFUJITSU LTD·Filed 2005·Granted Jan 23, 2007·15 cites·2 claims
- 0688US5659609AEcho canceller and waveform-distortion compensation deviceFUJITSU LTD·Filed 1995·Granted Aug 19, 1997·109 cites·13 claims
- 0787US5617450ADigital subscriber loop interface unitFUJITSU LTD·Filed 1994·Granted Apr 1, 1997·135 cites·3 claims
- 0883US8693898B2Adaptive equalizer, optical receiver, and tap coefficient correcting methodKOIZUMI NOBUKAZU·Filed 2011·Granted Apr 8, 2014·8 cites·20 claims
- 0979US11146428B2Adaptive equalizer, optical receiver, and adaptive equalization methodFUJITSU LTD·Filed 2020·Granted Oct 12, 2021·1 cites·8 claims
- 1078US7336627B1Digital subscriber line transmission method, apparatus and systemFUJITSU LTD·Filed 2000·Granted Feb 26, 2008·23 cites·11 claims
- 1177US7388711B2Controlling apparatus for optical amplifier and controlling method thereofFUJITSU LTD·Filed 2006·Granted Jun 17, 2008·4 cites·9 claims
- 1274US7434311B2Printed wiring board manufacturing methodMARUWA CORP·Filed 2005·Granted Oct 14, 2008·6 cites·5 claims
- 1374US5375147AJitter compensating deviceFUJITSU LTD·Filed 1992·Granted Dec 20, 1994·53 cites·4 claims
- 1472US5841809AAccess line termination unitFUJITSU LTD·Filed 1996·Granted Nov 24, 1998·45 cites·8 claims
- 1571US8606118B2Optical digital coherent receiverHATAE KAZUHIKO·Filed 2011·Granted Dec 10, 2013·4 cites·10 claims
- 1669US7024442B2Processing apparatusFUJITSU LTD·Filed 2001·Granted Apr 4, 2006·14 cites·20 claims
- 1768US9407471B2Adaptive equalizer tap coefficient correction method and optical receiverFUJITSU LTD·Filed 2013·Granted Aug 2, 2016·2 cites·16 claims
- 1868US7417792B2Optical amplification deviceFUJITSU LTD·Filed 2005·Granted Aug 26, 2008·4 cites·9 claims
- 1967US6965617B2Resynchronous control apparatus of subscriber communication machine, and resynchronizing methodFUJITSU LTD·Filed 2000·Granted Nov 15, 2005·12 cites·9 claims
- 2065US10560199B2Signal processing circuit and optical receiving deviceFUJITSU LTD·Filed 2019·Granted Feb 11, 2020·1 cites·8 claims
- 2165US7286495B2Digital subscriber line transmission method, apparatus and systemFUJITSU LTD·Filed 2005·Granted Oct 23, 2007·2 cites·4 claims
- 2265US7158290B2Controlling apparatus for optical amplifier and controlling method thereofFUJITSU LTD·Filed 2004·Granted Jan 2, 2007·7 cites·9 claims
- 2365US5638409AData receiving device for reproducing a received symbol from a received data signalFUJITSU LTD·Filed 1994·Granted Jun 10, 1997·49 cites·7 claims
- 2463US7126995B2Digital subscriber line communicating systemFUJITSU LTD·Filed 2004·Granted Oct 24, 2006·4 cites·4 claims
- 2563US2006026595A1Workflow management apparatus, workflow management program, and workflow management methodFUJITSU LTD·Filed 2004·Application pending·0 cites
- 2661US8861980B2Loop filterOHTOMO YASUO·Filed 2011·Granted Oct 14, 2014·2 cites·10 claims
- 2761US7386037B2Digital subscriber line communicating systemFUJITSU LTD·Filed 2004·Granted Jun 10, 2008·3 cites·5 claims
- 2861US7173984B2Digital subscriber line communicating systemFUJITSU LTD·Filed 2004·Granted Feb 6, 2007·3 cites·9 claims
- 2958US11476946B2Signal processing device and transmission deviceFUJITSU LTD·Filed 2021·Granted Oct 18, 2022·0 cites·8 claims
- 3058US8214189B2Performance evaluation simulationKATO TOMOKI·Filed 2008·Granted Jul 3, 2012·2 cites·8 claims
- 3156US11159352B2Adaptive equalizer, optical receiver, and optical transmission systemFUJITSU LTD·Filed 2020·Granted Oct 26, 2021·0 cites·11 claims
- 3255US7088783B2Digital subscriber line communicating system determining signal-to-noise ratiosFUJITSU LTD·Filed 2004·Granted Aug 8, 2006·1 cites·4 claims
- 3355US6944216B2Digital subscriber line communicating systemFUJITSU LTD·Filed 2004·Granted Sep 13, 2005·1 cites·6 claims
- 3455US6393051B1Digital subscriber line communicating system and a transceiver in the systemFUJITSU LTD·Filed 1999·Granted May 21, 2002·28 cites·10 claims
- 3554US2024063997A1Phase compensating device, optical receiver, and phase compensating methodFUJITSU LTD·Filed 2023·Application pending·0 cites
- 3651US9444554B2Digital coherent receiving apparatusFUJITSU LTD·Filed 2013·Granted Sep 13, 2016·0 cites·6 claims
- 3751US8428927B2Simulation method and simulation apparatusNAKAYAMA NORIYASU·Filed 2010·Granted Apr 23, 2013·1 cites·5 claims
- 3851US7555055B2Digital subscriber line communicating systemFUJITSU LTD·Filed 2004·Granted Jun 30, 2009·0 cites·6 claims
- 3951US7295620B2Digital subscriber line communicating systemFUJITSU LTD·Filed 2004·Granted Nov 13, 2007·0 cites·5 claims
- 4051US2007038660A1Support apparatus and computer-readable storage mediumFUJITSU LTD·Filed 2005·Application pending·0 cites
- 4147US10931485B2Adaptive equalization circuit and optical receiverFUJITSU LTD·Filed 2020·Granted Feb 23, 2021·0 cites·9 claims
- 4247US9496966B2Optical communication receiving device and frequency offset compensation methodFUJITSU LTD·Filed 2014·Granted Nov 15, 2016·0 cites·5 claims
- 4346US10177855B2Amplitude adjustment circuit, digital coherent receiver, and amplitude adjustment methodFUJITSU LTD·Filed 2017·Granted Jan 8, 2019·0 cites·10 claims
- 4445US2002090039A1Digital subscriber line communicating system and a transceiver in the systemFiled 2002·Application pending·0 cites
- 4544US9660733B2Signal processing apparatus, signal processing method, and signal processing systemFUJITSU LTD·Filed 2015·Granted May 23, 2017·0 cites·18 claims
- 4643US9680667B2Adaptive equalization circuit, digital coherent receiver, and adaptive equalization methodFUJITSU LTD·Filed 2016·Granted Jun 13, 2017·0 cites·12 claims
- 4743US2007124129A1Circuit evaluation method and circuit evaluation apparatusFUJITSU LTD·Filed 2006·Application pending·0 cites
- 4841US6965649B1Digital subscriber line communicating systemFUJITSU LTD·Filed 1999·Granted Nov 15, 2005·7 cites·2 claims
- 4939US7303943B2Method of manufacturing electric deviceSEIKO INSTR INC·Filed 2004·Granted Dec 4, 2007·0 cites·7 claims
- 5039US7072386B1Digital subscriber line communicating system and a transceiver in the systemFUJITSU LTD·Filed 1999·Granted Jul 4, 2006·9 cites·32 claims
Showing the top 50 of 54 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →