Inventor · disambiguated record
Yohei Ishikawa
Also filed as: ISHIKAWA YOHEI · MUKAIYAMA KAZUTAKA
59 granted patents·9 pending applications·1,031 citations·filing 1996–2021
99Inventor score
Files withMURATA MANUFACTURING CO56DOWA ELECTRONICS MATERIALS CO LTD4HITACHI CHEMICAL CO LTD3RESONAC CORP3ISHIKAWA YOHEI1
Top patents by PatentIndex Score
68 records- 0195US5900847ADielectric lens apparatusMURATA MANUFACTURING CO·Filed 1997·Granted May 4, 1999·229 cites·26 claims
- 0291US6861920B2Complex circuit board, nonreciprocal circuit device, resonator, filter, duplexer communications device, circuit module, complex circuit board manufacturing method, and nonreciprocal circuit device manufacturing methodMURATA MANUFACTURING CO·Filed 2003·Granted Mar 1, 2005·26 cites·7 claims
- 0391US6411181B1Dielectric resonator, inductor, capacitor, dielectric filter, oscillator, and communication deviceMURATA MANUFACTURING CO·Filed 2000·Granted Jun 25, 2002·27 cites·12 claims
- 0489US6188360B1Radio-frequency radiation source, radio frequency radiation source array, antenna module, and radio equipmentMURATA MANUFACTURING CO·Filed 1999·Granted Feb 13, 2001·49 cites·31 claims
- 0588US5986527APlanar dielectric line and integrated circuit using the same lineMURATA MANUFACTURING CO·Filed 1997·Granted Nov 16, 1999·49 cites·15 claims
- 0684US6628230B2Radio frequency module, communication device, and radar deviceMURATA MANUFACTURING CO·Filed 2002·Granted Sep 30, 2003·21 cites·15 claims
- 0784US6144268AHigh-frequency transmission line, dielectric resonator, filter, duplexer, and communication device, with an electrode having gaps in an edge portionMURATA MANUFACTURING CO·Filed 1998·Granted Nov 7, 2000·37 cites·12 claims
- 0881US5770989ANonradiative dielectric line apparatus and instrument for measuring characteristics of a circuit boardMURATA MANUFACTURING CO·Filed 1996·Granted Jun 23, 1998·26 cites·5 claims
- 0980US6515554B2High-frequency circuit device and communication apparatusMURATA MANUFACTURING CO·Filed 2001·Granted Feb 4, 2003·13 cites·15 claims
- 1079US5920245ANonradiative dielectric line apparatus including a specifically oriented circuit boardMURATA MANUFACTURING CO·Filed 1998·Granted Jul 6, 1999·24 cites·28 claims
- 1177US6104264ADielectric waveguide of a laminated structureMURATA MANUFACTURING CO·Filed 1998·Granted Aug 15, 2000·26 cites·14 claims
- 1277US5945894ADielectric resonator and filter utilizing a non-radiative dielectric waveguide deviceMURATA MANUFACTURING CO·Filed 1997·Granted Aug 31, 1999·27 cites·15 claims
- 1375US6472960B1Complex circuit board with an electrode and air gap between dielectric and magnetic substratesMURATA MANUFACTURING CO·Filed 1999·Granted Oct 29, 2002·18 cites·17 claims
- 1475US6052087AAntenna device and radar moduleMURATA MANUFACTURING CO·Filed 1998·Granted Apr 18, 2000·48 cites·6 claims
- 1573US6504456B2Communication device having a spurious wave blocking circuit formed of a plural fundamental patternMURATA MANUFACTURING CO·Filed 2001·Granted Jan 7, 2003·10 cites·12 claims
- 1672US6486754B1Resonator, filter, duplexer, and communication deviceMURATA MANUFACTURING CO·Filed 1999·Granted Nov 26, 2002·21 cites·18 claims
- 1772US6323740B1High-frequency circuit device and communication apparatusMURATA MANUFACTURING CO·Filed 1999·Granted Nov 27, 2001·18 cites·37 claims
- 1871US6828867B2Slot electrode dielectric resonator, inductor, capacitor, dielectric filter, oscillator, and communication deviceMURATA MANUFACTURING CO·Filed 2003·Granted Dec 7, 2004·7 cites·3 claims
- 1970US5764116ADielectric resonator and filter utilizing a nonradiative dielectric waveguide deviceMURATA MANUFACTURING CO·Filed 1996·Granted Jun 9, 1998·20 cites·8 claims
- 2069US6449307B1Apparatus for measuring electrical characteristics of circuitMURATA MANUFACTURING CO·Filed 1999·Granted Sep 10, 2002·29 cites·10 claims
- 2167US12280357B2Adsorbent particles, base particle, packed column, and method for recovering rare-earth elementRESONAC CORP·Filed 2020·Granted Apr 22, 2025·0 cites·12 claims
- 2267US7518472B2Transmission line connecting structure and transmission/reception deviceMURATA MANUFACTURING CO·Filed 2005·Granted Apr 14, 2009·3 cites·20 claims
- 2367US6184758B1Dielectric resonator formed by polygonal openings in a dielectric substrate, and a filter, duplexer, and communication apparatus using sameMURATA MANUFACTURING CO·Filed 1998·Granted Feb 6, 2001·17 cites·27 claims
- 2467US5867120ATransmitter-receiverMURATA MANUFACTURING CO·Filed 1997·Granted Feb 2, 1999·36 cites·6 claims
- 2564US6359536B1High frequency multi-layer module with electronic component receiving aperture and conductive viaMURATA MANUFACTURING CO·Filed 2000·Granted Mar 19, 2002·10 cites·4 claims
- 2664US6175335B1Dielectric lens antenna having heating body and radio equipment including the sameMURATA MANUFACTURING CO·Filed 1999·Granted Jan 16, 2001·31 cites·26 claims
- 2762US5920243AMulti-layer thin-film electrode, for a high-frequency transmission line, resonator, and filterMURATA MANUFACTURING CO·Filed 1997·Granted Jul 6, 1999·15 cites·14 claims
- 2860US5872485ADielectric line waveguide which forms electronic circuitsMURATA MANUFACTURING CO·Filed 1997·Granted Feb 16, 1999·13 cites·19 claims
- 2960US5786740ADielectric resonator capable of varying resonant frequencyMURATA MANUFACTURING CO·Filed 1996·Granted Jul 28, 1998·13 cites·25 claims
- 3059US12364967B2Adsorbent particles, method for producing adsorbent particles, base material particles, filling column and method for recovering rare earth elementRESONAC CORP·Filed 2020·Granted Jul 22, 2025·0 cites·9 claims
- 3159US6891452B2High-frequency circuit device and transmitter/receiverMURATA MANUFACTURING CO·Filed 2003·Granted May 10, 2005·5 cites·13 claims
- 3258US6052041ATM mode dielectric resonator and TM mode dielectric filter and duplexer using the resonatorMURATA MANUFACTURING CO·Filed 1997·Granted Apr 18, 2000·10 cites·19 claims
- 3357US11556070B2Carrier core material and electrophotographic development carrier using same and electrophotographic developerDOWA ELECTRONICS MATERIALS CO LTD·Filed 2018·Granted Jan 17, 2023·0 cites·3 claims
- 3457US2023405553A1Adsorbent particles, method for producing adsorbent particles, base material particles, filling column, and method for recovering rare earth elementRESONAC CORP·Filed 2021·Application pending·0 cites
- 3556US9964878B2Carrier core material and electrophotographic development carrier using same and electrophotographic developerDOWA ELECTRONICS MATERIALS CO LTD·Filed 2016·Granted May 8, 2018·0 cites·6 claims
- 3656US9740129B2Ferrite particles, carrier for electrophotographic development using same, and developer for electrophotographyDOWA ELECTRONICS MATERIALS CO LTD·Filed 2014·Granted Aug 22, 2017·0 cites·6 claims
- 3756US6069543ADielectric resonator capable of varying resonant frequencyMURATA MANUFACTURING CO·Filed 1998·Granted May 30, 2000·11 cites·3 claims
- 3856US6011983ABand-pass filter apparatus using superconducting integrated nonradiative dielectric waveguideMURATA MANUFACTURING CO·Filed 1997·Granted Jan 4, 2000·11 cites·24 claims
- 3954US6066598ASuperconducting multilayer electrode and method of producing sameMURATA MANUFACTURING CO·Filed 1996·Granted May 23, 2000·15 cites·9 claims
- 4053US6882300B2Guide marker and visual guide marker deviceMURATA MANUFACTURING CO·Filed 2003·Granted Apr 19, 2005·8 cites·19 claims
- 4153US6646516B2Complex circuit board, nonreciprocal circuit device, resonator, filter, duplexer, communications device, circuit module, complex circuit board manufacturing method, and nonreciprocal circuit device manufacturing methodMURATA MANUFACTURING CO·Filed 2002·Granted Nov 11, 2003·2 cites·6 claims
- 4253US6556107B2Dielectric resonator, inductor, capacitor, dielectric filter, oscillator, and communication deviceMURATA MANUFACTURING CO·Filed 2002·Granted Apr 29, 2003·2 cites·9 claims
- 4351US6255914B1TM mode dielectric resonator and TM mode dielectric filter and duplexer using the resonatorMURATA MANUFACTURING CO·Filed 2000·Granted Jul 3, 2001·2 cites·17 claims
- 4450US6778031B2High-frequency circuit device using slot line and communication apparatus having high frequency circuit deviceMURATA MANUFACTURING CO·Filed 2003·Granted Aug 17, 2004·4 cites·18 claims
- 4550US6563477B2Antenna apparatus and transmission and receiving apparatus using sameMURATA MANUFACTURING CO·Filed 2001·Granted May 13, 2003·5 cites·21 claims
- 4647US6285269B1High-frequency semiconductor device having microwave transmission line being formed by a gate electrode source electrode and a dielectric layer in betweenMURATA MANUFACTURING CO·Filed 1997·Granted Sep 4, 2001·11 cites·18 claims
- 4747US6100554AHigh-frequency semiconductor deviceMURATA MANUFACTURING CO·Filed 1997·Granted Aug 8, 2000·13 cites·9 claims
- 4846US6008755AAntenna-shared distributor and transmission and receiving apparatus using sameMURATA MANUFACTURING CO·Filed 1997·Granted Dec 28, 1999·21 cites·24 claims
- 4946US2015219065A1Power storage systemISHIKAWA YOHEI·Filed 2013·Application pending·0 cites
- 5044US2005275714A1Eyeglass interface device and security systemMURATA MANUFACTURING CO·Filed 2005·Application pending·0 cites
Showing the top 50 of 68 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →