Inventor · disambiguated record
Seiji Okamoto
Also filed as: OKAMOTO SEIJI
59 granted patents·8 pending applications·336 citations·filing 1982–2024
98Inventor score
Files withNIPPON TELEGRAPH & TELEPHONE37KAWAI MUSICAL INSTR MFG CO7OKI ELECTRIC IND CO LTD6SHARP KK5KK KAWAI GAKKI SEISAKUSHO3
Top patents by PatentIndex Score
67 records- 0195US11037542B2Keyboard device for electronic keyboard instrumentKAWAI MUSICAL INSTRUMENTS MFG CO LTD·Filed 2020·Granted Jun 15, 2021·4 cites·8 claims
- 0294US9621299B2Coherent communication system, communication method, and transmission methodNIPPON TELEGRAPH & TELEPHONE·Filed 2014·Granted Apr 11, 2017·15 cites·22 claims
- 0389US7908935B2Feces collection containerNIPRO CORP·Filed 2006·Granted Mar 22, 2011·13 cites·14 claims
- 0485US11546064B2Optical transmission system and transmission mode selecting methodNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Jan 3, 2023·4 cites·18 claims
- 0585US6572771B2Waste water treatment methodSHARP KK·Filed 2002·Granted Jun 3, 2003·26 cites·21 claims
- 0682US11881897B2Optical and electronic integrated switch and optical network systemNIPPON TELEGRAPH & TELEPHONE·Filed 2020·Granted Jan 23, 2024·2 cites·8 claims
- 0782US11283528B2Digital coherent receiver and digital coherent receiving methodNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Mar 22, 2022·4 cites·8 claims
- 0881US11979694B2Optical and electronic integrated switchNIPPON TELEGRAPH & TELEPHONE·Filed 2020·Granted May 7, 2024·2 cites·7 claims
- 0981US11930309B2Optical and electronic integrated switchNIPPON TELEGRAPH & TELEPHONE·Filed 2020·Granted Mar 12, 2024·2 cites·11 claims
- 1079US9444483B2Switch circuit, analog-to-digital converter, and integrated circuitSOCIONEXT INC·Filed 2015·Granted Sep 13, 2016·4 cites·15 claims
- 1179US5923196ABand-selectable phase-locked loopOKI ELECTRIC IND CO LTD·Filed 1997·Granted Jul 13, 1999·36 cites·3 claims
- 1276US4494824ALiquid crystal display with small impedance orienting filmSHARP KK·Filed 1982·Granted Jan 22, 1985·31 cites·6 claims
- 1375US6005440AOperational amplifierOKI ELECTRIC IND CO LTD·Filed 1998·Granted Dec 21, 1999·35 cites·20 claims
- 1474US11728889B2Optical transmitting apparatus and transmission characteristics estimation methodNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Aug 15, 2023·2 cites·8 claims
- 1574US6413417B1Waste water treatment apparatusSHARP KK·Filed 2000·Granted Jul 2, 2002·15 cites·21 claims
- 1674US2024422097A1Optical and electronic integrated switchNIPPON TELEGRAPH & TELEPHONE·Filed 2024·Application pending·0 cites
- 1773US10038507B2Optical transmission system, phase compensation method, and optical reception apparatusNIPPON TELEGRAPH & TELEPHONE·Filed 2014·Granted Jul 31, 2018·3 cites·16 claims
- 1872US12457040B2Optical transmission system and transmission mode selecting methodNTT INC·Filed 2022·Granted Oct 28, 2025·0 cites·2 claims
- 1971US10171173B2Optical signal transmission apparatus and optical signal transmission methodNIPPON TELEGRAPH & TELEPHONE·Filed 2015·Granted Jan 1, 2019·2 cites·18 claims
- 2070US11342990B2State estimating device and communication systemNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted May 24, 2022·2 cites·17 claims
- 2166US11683093B2Wavelength dispersion compensation apparatus, optical receiving apparatus, wavelength dispersion compensation method and computer programNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Jun 20, 2023·1 cites·8 claims
- 2266US10841006B2Signal-to-noise ratio estimation method, optical transmission apparatus, and optical transmission systemNIPPON TELEGRAPH & TELEPHONE·Filed 2018·Granted Nov 17, 2020·1 cites·10 claims
- 2364US11258512B2Receiving apparatus and receiving methodNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Feb 22, 2022·0 cites·5 claims
- 2462US12308006B2Musical tone generating device and control method of musical tone generating deviceKK KAWAI GAKKI SEISAKUSHO·Filed 2021·Granted May 20, 2025·0 cites·15 claims
- 2560US5788838AUltrapure water production system having pretreatment system for performing both anaerobic and aerobic organism treatmentsSHARP KK·Filed 1996·Granted Aug 4, 1998·24 cites·3 claims
- 2659US5289058AMOS operational amplifier circuitOKI ELECTRIC IND CO LTD·Filed 1992·Granted Feb 22, 1994·15 cites·23 claims
- 2758US12107762B2Optical and electronic integrated switchNIPPON TELEGRAPH & TELEPHONE·Filed 2020·Granted Oct 1, 2024·0 cites·6 claims
- 2855US6762357B2Resonance apparatus, resonance method and computer program for resonance processingKAWAI MUSICAL INSTR MFG CO·Filed 2002·Granted Jul 13, 2004·6 cites·23 claims
- 2953US11816026B2Digital signal processing device and control method of digital signal processing deviceKK KAWAI GAKKI SEISAKUSHO·Filed 2021·Granted Nov 14, 2023·0 cites·10 claims
- 3051US11581944B2Optical transmission systemNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Feb 14, 2023·0 cites·8 claims
- 3150US11463169B2Wavelength dispersion amount estimation apparatusNIPPON TELEGRAPH & TELEPHONE·Filed 2020·Granted Oct 4, 2022·0 cites·8 claims
- 3250US11381317B2Optical receiving apparatus and waveform distortion compensation methodNIPPON TELEGRAPH & TELEPHONE·Filed 2020·Granted Jul 5, 2022·0 cites·5 claims
- 3350US2025323732A1Estimation apparatus, estimation method and programNIPPON TELEGRAPH & TELEPHONE·Filed 2022·Application pending·0 cites
- 3449US12224889B2Adaptive equalization filter and method for updating filter coefficientsNIPPON TELEGRAPH & TELEPHONE·Filed 2020·Granted Feb 11, 2025·0 cites·8 claims
- 3549US10230853B2Terminal device, diagnosis system and information output method for outputting information comprising an instruction regarding how to record a sound from a target apparatusFUJI XEROX CO LTD·Filed 2016·Granted Mar 12, 2019·0 cites·5 claims
- 3649US5559298AWaveform read-out system for an electronic musical instrumentKAWAI MUSICAL INSTR MFG CO·Filed 1994·Granted Sep 24, 1996·10 cites·8 claims
- 3748US5691496AMusical tone control apparatus for filter processing a musical tone waveform ONLY in a transient band between a pass-band and a stop-bandKAWAI MUSICAL INSTR MFG CO·Filed 1996·Granted Nov 25, 1997·12 cites·42 claims
- 3847US11444699B2Optical transmission system, optical receiving apparatus and optical transmission methodNIPPON TELEGRAPH & TELEPHONE·Filed 2020·Granted Sep 13, 2022·0 cites·6 claims
- 3947US11349572B2Optical transmission system, optical transmitting apparatus, and optical receiving apparatusNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted May 31, 2022·0 cites·7 claims
- 4047US11303359B2Communication system, optical transmitting apparatus, and optical receiving apparatusNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Apr 12, 2022·0 cites·8 claims
- 4147US2025038860A1Estimation method, optical receiving apparatus, and computer programNIPPON TELEGRAPH & TELEPHONE·Filed 2022·Application pending·0 cites
- 4247US2025055573A1Gain adjustment method, optical receiving apparatus and computer programNIPPON TELEGRAPH & TELEPHONE·Filed 2021·Application pending·0 cites
- 4346US11671119B2Signal processing apparatus and signal processing methodNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Jun 6, 2023·0 cites·2 claims
- 4446US11556303B2Digital signal processing device and control method of digital signal processing deviceKK KAWAI GAKKI SEISAKUSHO·Filed 2021·Granted Jan 17, 2023·0 cites·5 claims
- 4546US11245487B2Optical transmission control method and optical transmission systemNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Feb 8, 2022·0 cites·6 claims
- 4646US6177005B1System for producing ultrapure water having a TOC density of no more than 0.5 ppbSHARP KK·Filed 1998·Granted Jan 23, 2001·13 cites·17 claims
- 4746US5767801ALinear type digital-to-analog converter and driving method thereforOKI ELECTRIC IND CO LTD·Filed 1997·Granted Jun 16, 1998·11 cites·5 claims
- 4846US2024187107A1Frequency offset estimation apparatus, receiving apparatus, frequency offset estimation method and programNIPPON TELEGRAPH & TELEPHONE·Filed 2021·Application pending·0 cites
- 4945US11799547B2Signal processing apparatus, signal processing method, and programNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Oct 24, 2023·0 cites·4 claims
- 5045US11316588B2Wavelength dispersion compensation apparatus, wavelength dispersion compensation method, and optical receiving apparatusNIPPON TELEGRAPH & TELEPHONE·Filed 2019·Granted Apr 26, 2022·0 cites·5 claims
Showing the top 50 of 67 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →