Inventor · disambiguated record
Takehiko Yamakawa
Also filed as: YAMAKAWA TAKEHIKO
41 granted patents·20 pending applications·440 citations·filing 2000–2023
97Inventor score
Files withPANASONIC IP MAN CO LTD18MATSUSHITA ELECTRIC INDUSTRIAL CO LTD15PANASONIC CORP14YAMAKAWA TAKEHIKO6ONISHI KEIJI3
Top patents by PatentIndex Score
61 records- 0196US7675389B2Piezoelectric resonator, piezoelectric filter, and duplexer and communication device using the samePANASONIC CORP·Filed 2006·Granted Mar 9, 2010·45 cites·11 claims
- 0295US6985712B2RF device and communication apparatus using the sameMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Jan 10, 2006·53 cites·11 claims
- 0394US7259498B2Piezoelectric resonator, filter, and duplexerMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Aug 21, 2007·60 cites·24 claims
- 0493US7230511B2Thin film bulk acoustic resonator, method for producing the same, filter, composite electronic component device, and communication deviceMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Jun 12, 2007·60 cites·6 claims
- 0592US6707353B1Dielectric filterMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Mar 16, 2004·37 cites·7 claims
- 0690US11705260B2Magnetic device including winding and insulators, and power conversion device using the samePANASONIC IP MAN CO LTD·Filed 2020·Granted Jul 18, 2023·2 cites·15 claims
- 0788US7479847B2Filter using piezoelectric resonatorPANASONIC CORP·Filed 2006·Granted Jan 20, 2009·17 cites·17 claims
- 0887US7986198B2Frequency-variable acoustic thin film resonator, filter and communication apparatus using the samePANASONIC CORP·Filed 2007·Granted Jul 26, 2011·17 cites·14 claims
- 0986US8570112B2Oscillator with MEMS resonatorYAMAKAWA TAKEHIKO·Filed 2012·Granted Oct 29, 2013·8 cites·10 claims
- 1086US7893793B2Film bulk acoustic wave resonator and method for manufacturing the samePANASONIC CORP·Filed 2007·Granted Feb 22, 2011·16 cites·22 claims
- 1186US7623007B2Device including piezoelectric thin film and a support having a vertical cross-section with a curvaturePANASONIC CORP·Filed 2006·Granted Nov 24, 2009·15 cites·10 claims
- 1284US8306499B2High-frequency filterYAMAKAWA TAKEHIKO·Filed 2008·Granted Nov 6, 2012·9 cites·11 claims
- 1380US7301420B2Piezoelectric resonator filterMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Nov 27, 2007·20 cites·18 claims
- 1479US12057282B2Electromagnetic relayPANASONIC IP MAN CO LTD·Filed 2023·Granted Aug 6, 2024·0 cites·3 claims
- 1579US8289103B2Filter device having attenuation polesYAMAKAWA TAKEHIKO·Filed 2007·Granted Oct 16, 2012·11 cites·15 claims
- 1672US9852841B2Coil structure, transformer, and power converterPANASONIC IP MAN CO LTD·Filed 2015·Granted Dec 26, 2017·1 cites·19 claims
- 1772US8525605B2OscillatorYAMAKAWA TAKEHIKO·Filed 2011·Granted Sep 3, 2013·4 cites·8 claims
- 1871US10186977B2Resonant power converterPANASONIC IP MAN CO LTD·Filed 2018·Granted Jan 22, 2019·2 cites·2 claims
- 1971US7113055B2Piezoelectric resonator, method of manufacturing piezoelectric resonator, and filter, duplexer, and communication device using piezoelectric resonatorMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Sep 26, 2006·11 cites·11 claims
- 2067US7417360B2Piezoelectric resonator and method for producing the sameMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2006·Granted Aug 26, 2008·5 cites·10 claims
- 2166US8022794B2Micromachine switch, filter circuit, duplexer circuit, and communication devicePANASONIC CORP·Filed 2007·Granted Sep 20, 2011·4 cites·12 claims
- 2266US7138888B2Filter using piezoelectric resonatorMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Nov 21, 2006·10 cites·13 claims
- 2364US8516905B2MEMS pressure sensorNAKAMURA KUNIHIKO·Filed 2012·Granted Aug 27, 2013·2 cites·9 claims
- 2463US2021027964A1Electromagnetic relayPANASONIC IP MAN CO LTD·Filed 2019·Application pending·0 cites
- 2563US2025232910A1Bobbin-less transformer with windings each of three-layer insulating wire having self-fusing layerPANASONIC IP MAN CO LTD·Filed 2023·Application pending·0 cites
- 2662US8698257B2Resonator and production method thereofKAMIYAMA TOMOHIDE·Filed 2010·Granted Apr 15, 2014·2 cites·7 claims
- 2760US7639103B2Piezoelectric filter, antenna duplexer, and communications apparatus employing piezoelectric resonatorPANASONIC CORP·Filed 2007·Granted Dec 29, 2009·3 cites·6 claims
- 2859US12400783B2Transformer including first and second windings, and first and second cores, and having structure for preventing core crackingPANASONIC IP MAN CO LTD·Filed 2020·Granted Aug 26, 2025·0 cites·18 claims
- 2959US6515559B1In-band-flat-group-delay type dielectric filter and linearized amplifier using the sameMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Feb 4, 2003·4 cites·20 claims
- 3059US2024071678A1Transformer device provided with two cores and cooling device for avoiding core crackingPANASONIC IP MAN CO LTD·Filed 2021·Application pending·0 cites
- 3157USRE42009EPiezoelectric resonator having a spurious component control layer, filter using the piezoelectric resonator, and duplexer using the piezoelectric resonatorPANASONIC CORP·Filed 2008·Granted Dec 28, 2010·2 cites·24 claims
- 3257US7242130B2Piezoelectric device, antenna duplexer, and method of manufacturing piezoelectric resonators used thereforMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Jul 10, 2007·6 cites·20 claims
- 3357US7106152B2Dielectric resonator, dielectric filter, and method of supporting dielectric resonance elementMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Sep 12, 2006·4 cites·11 claims
- 3456US7230367B2Piezoelectric resonator, production method thereof, filter, duplexer, and communication deviceMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Jun 12, 2007·6 cites·11 claims
- 3556US2016365804A1Magnetic device including winding and insulators, and power conversion device using the samePANASONIC IP MAN CO LTD·Filed 2016·Application pending·0 cites
- 3652US6794959B2In-band-flat-group-delay type dielectric filter and linearized amplifier using the sameMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Sep 21, 2004·2 cites·9 claims
- 3752US2024088793A1Power conversion apparatus capable of controlling power conversion circuits to operate selectivelyPANASONIC IP MAN CO LTD·Filed 2021·Application pending·0 cites
- 3852US2024055995A1Electric power conversion apparatus capable of controlling power conversion circuits to operate selectively and sequentiallyPANASONIC IP MAN CO LTD·Filed 2021·Application pending·0 cites
- 3948US11373828B2Electromagnetic relay and control method thereofPANASONIC IP MAN CO LTD·Filed 2019·Granted Jun 28, 2022·0 cites·5 claims
- 4047US2014339954A1Vibration power generatorPANASONIC CORP·Filed 2014·Application pending·0 cites
- 4146US7054608B2Multilayer electronic component and communication apparatus and methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted May 30, 2006·2 cites·3 claims
- 4246US2007046157A1Piezoelectric device and method of manufacturing piezoelectric resonatorsONISHI KEIJI·Filed 2006·Application pending·0 cites
- 4345US12101034B2Power converter apparatus converting input power having a predetermined voltage into output power having a predetermined output voltage over wide range with higher efficiencyPANASONIC IP MAN CO LTD·Filed 2020·Granted Sep 24, 2024·0 cites·8 claims
- 4445US7719390B2Dual mode piezoelectric filter, method of manufacturing the same, high frequency circuit component and communication device using the samePANASONIC CORP·Filed 2008·Granted May 18, 2010·0 cites·24 claims
- 4545US2009133237A1Piezoelectric device and method of manufacturing piezoelectric resonatorsONISHI KEIJI·Filed 2008·Application pending·0 cites
- 4644US7477115B2Piezoelectric resonator, method of manufacturing piezoelectric resonator, and filter, duplexer, and communication device using piezoelectric resonatorPANASONIC CORP·Filed 2006·Granted Jan 13, 2009·0 cites·7 claims
- 4744US2014055002A1Vibration power generator, rotating body and communication devicePANASONIC CORP·Filed 2012·Application pending·0 cites
- 4844US2014070664A1Vibration power generatorPANASONIC CORP·Filed 2013·Application pending·0 cites
- 4943US9672974B2Magnetic component and power transfer devicePANASONIC IP MAN CO LTD·Filed 2015·Granted Jun 6, 2017·0 cites·13 claims
- 5043US2017338700A1Rotary machine including rotor, stator, and insertion memberPANASONIC IP MAN CO LTD·Filed 2017·Application pending·0 cites
Showing the top 50 of 61 patent records by PatentIndex Score.
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