Inventor · disambiguated record
Keiji Tsukada
Also filed as: TSUKADA KEIJI
45 granted patents·3 pending applications·1,209 citations·filing 1989–2018
98Inventor score
Files withHITACHI LTD33HITACHI HIGH TECH CORP4TSUKADA KEIJI3KIWA TOSHIHIKO2NAT UNIV CORPORATION OKAYAMA UNIV2
Top patents by PatentIndex Score
48 records- 0197US5132012ALiquid chromatographHITACHI LTD·Filed 1989·Granted Jul 21, 1992·201 cites·7 claims
- 0290US6230037B1Biomagnetic field measuring method and apparatusHITACHI LTD·Filed 1998·Granted May 8, 2001·61 cites·49 claims
- 0385US7759931B2Device for measuring magnetic impedanceUNIV OKAYAMA NAT UNIV CORP·Filed 2006·Granted Jul 20, 2010·19 cites·16 claims
- 0485US7525308B2Magnetic detecting device and material identifying deviceUNIV OKAYAMA·Filed 2005·Granted Apr 28, 2009·29 cites·8 claims
- 0584US6539245B2Biomagnetic field measuring method and apparatusHITACHI LTD·Filed 2001·Granted Mar 25, 2003·23 cites·7 claims
- 0682US8710440B2Measuring device and measuring method that use pulsed electromagnetic waveKIWA TOSHIHIKO·Filed 2011·Granted Apr 29, 2014·8 cites·6 claims
- 0782US7403809B2Biomagnetic field measuring method and apparatusHITACHI LTD·Filed 2004·Granted Jul 22, 2008·19 cites·2 claims
- 0882US6853185B2Magnetic field measurement systemHITACHI LTD·Filed 2004·Granted Feb 8, 2005·27 cites·12 claims
- 0982US6735460B2Biomagnetic field measuring method and apparatusHITACHI LTD·Filed 2002·Granted May 11, 2004·20 cites·2 claims
- 1077US6462540B1Magnetic field measuring apparatus which enables external magnetic noise cancellationHITACHI LTD·Filed 2000·Granted Oct 8, 2002·37 cites·18 claims
- 1177US5344545AElectrolytic sensor for measuring the content of gas in a fluidHITACHI LTD·Filed 1992·Granted Sep 6, 1994·38 cites·16 claims
- 1276US6665553B2Biomagnetic field measuring apparatus using squid magnetometers for evaluating a rotational property of a current in a subjectHITACHI LTD·Filed 2002·Granted Dec 16, 2003·79 cites·3 claims
- 1375US7193413B2Magnetic field measurement apparatusHITACHI HIGH TECH CORP·Filed 2004·Granted Mar 20, 2007·18 cites·19 claims
- 1475US6711281B2Method of measuring a biomagnetic field, method of analyzing a measured biomagnetic field, and method of displaying biomagnetic field data, and apparatus thereforHITACHI LTD·Filed 2002·Granted Mar 23, 2004·23 cites·12 claims
- 1575US6522908B1Biomagnetic field measuring apparatusHITACHI LTD·Filed 2000·Granted Feb 18, 2003·85 cites·19 claims
- 1674US8283704B2Gas sensorTSUKADA KEIJI·Filed 2009·Granted Oct 9, 2012·4 cites·2 claims
- 1773US6665552B2Gradiometer integrating pickup coils and magnetic field measurement systemHITACHI LTD·Filed 2001·Granted Dec 16, 2003·17 cites·16 claims
- 1872US6815949B2Apparatus for measuring a magnetic fieldHITACHI LTD·Filed 2002·Granted Nov 9, 2004·60 cites·7 claims
- 1971US5250168AIntegrated ion sensorHITACHI LTD·Filed 1991·Granted Oct 5, 1993·36 cites·28 claims
- 2065US6681131B2Apparatus for measuring bio-magnetic fieldsHITACHI LTD·Filed 2001·Granted Jan 20, 2004·36 cites·20 claims
- 2165US6528994B2Magnetic field measurement apparatusHITACHI LTD·Filed 2001·Granted Mar 4, 2003·12 cites·17 claims
- 2263US5102525APlanar oxygen sensorHITACHI LTD·Filed 1990·Granted Apr 7, 1992·27 cites·33 claims
- 2362US7433506B2Method of measuring a biomagnetic field, method of analyzing a measured biomagnetic field, method of displaying biomagnetic field data, and an apparatus thereforHITACHI LTD·Filed 2007·Granted Oct 7, 2008·1 cites·17 claims
- 2461US6842637B2Magnetic field measurement apparatusHITACHI LTD·Filed 2001·Granted Jan 11, 2005·9 cites·4 claims
- 2557US7340289B2Biomagnetic field measuring apparatusHITACHI HIGH TECH CORP·Filed 2003·Granted Mar 4, 2008·16 cites·6 claims
- 2657US6269262B1Biomagnetic field measuring apparatusHITACHI LTD·Filed 1998·Granted Jul 31, 2001·89 cites·3 claims
- 2756US7400984B2Biomagnetic measurement apparatusHITACHI HIGH TECH CORP·Filed 2004·Granted Jul 15, 2008·13 cites·13 claims
- 2855US7798981B2Living body inspection apparatusHITACHI LTD·Filed 2008·Granted Sep 21, 2010·0 cites·7 claims
- 2955US6745063B2Biomagnetic field measuring apparatusHITACHI LTD·Filed 2001·Granted Jun 1, 2004·13 cites·11 claims
- 3054US11275128B2Magnetic field measuring deviceNAT UNIV CORPORATION OKAYAMA UNIV·Filed 2018·Granted Mar 15, 2022·0 cites·4 claims
- 3154US7363070B2Biomagnetic measurement apparatusHITACHI HIGH TECH CORP·Filed 2004·Granted Apr 22, 2008·11 cites·17 claims
- 3253US7194121B2Method of measuring a biomagnetic field, method of analyzing a measured biomagnetic field, method of displaying biomagnetic field data, and an apparatus thereforHITACHI LTD·Filed 2004·Granted Mar 20, 2007·5 cites·2 claims
- 3352US6609019B1Physiological magnetic field measuring instrument for measuring magnetic field at plural positions of living bodyHITACHI LTD·Filed 2000·Granted Aug 19, 2003·8 cites·4 claims
- 3450US7455648B2Living body inspection apparatusHITACHI LTD·Filed 2004·Granted Nov 25, 2008·3 cites·9 claims
- 3547US8300223B2Measurement device for the distribution of chemical concentrationKIWA TOSHIHIKO·Filed 2008·Granted Oct 30, 2012·0 cites·3 claims
- 3646US2021072187A1Non-destructive inspection deviceNAT UNIV CORPORATION OKAYAMA UNIV·Filed 2018·Application pending·0 cites
- 3743US6473518B1Method of measuring a biomagnetic field, method of analyzing a measured biomagnetic field, method of displaying biomagnetic field data, and apparatus thereforHITACHI LTD·Filed 1998·Granted Oct 29, 2002·24 cites·37 claims
- 3843US6275719B1Biomagnetic field measurement apparatusHITACHI LTD·Filed 1999·Granted Aug 14, 2001·34 cites·32 claims
- 3942US8608927B2Ion sensorTSUKADA KEIJI·Filed 2010·Granted Dec 17, 2013·0 cites·8 claims
- 4041US7432705B2Magnetic shields and instruments for measuring biomagnetic fieldsHITACHI LTD·Filed 2003·Granted Oct 7, 2008·4 cites·11 claims
- 4140US9146214B2Leakage magnetic flux flaw inspection method and deviceTSUKADA KEIJI·Filed 2010·Granted Sep 29, 2015·0 cites·10 claims
- 4240US6961605B2Method for processing biomagnetic field data, magnetic field contour mapping, forming their waveforms and a biomagnetic instrument using the sameHITACHI LTD·Filed 2001·Granted Nov 1, 2005·3 cites·6 claims
- 4340US6628978B1Biomagnetism measurement device and method of biomagnetism measurement using the deviceHITACHI LTD·Filed 1999·Granted Sep 30, 2003·28 cites·32 claims
- 4440US6424853B1Magnetic field measurement apparatusHITACHI LTD·Filed 1998·Granted Jul 23, 2002·27 cites·2 claims
- 4540US2003097056A1Biomagnetic field measuring apparatusFiled 2002·Application pending·0 cites
- 4639US5352352ACarbonic acid gas sensorHITACHI LTD·Filed 1992·Granted Oct 4, 1994·26 cites·12 claims
- 4739US2003218872A1Superconducting magnetic shieldFiled 2003·Application pending·0 cites
- 4836US6336043B1Method for processing biomagnetic field data, magnetic field contour mapping, forming their waveforms and a biomagnetic instrument using the sameHITACHI LTD·Filed 1998·Granted Jan 1, 2002·16 cites·2 claims
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