Inventor · disambiguated record
Takahiko Fujiwara
Also filed as: FUJIWARA TAKAHIKO
51 granted patents·14 pending applications·180 citations·filing 1991–2024
98Inventor score
Top patents by PatentIndex Score
65 records- 0192US8464522B2Control apparatus for internal combustion engineFUJIWARA TAKAHIKO·Filed 2008·Granted Jun 18, 2013·24 cites·7 claims
- 0291US8772208B2Additive agent, oil filter and lubricating device for machineFUKUTOMI IPPEI·Filed 2011·Granted Jul 8, 2014·8 cites·8 claims
- 0390US8464515B2Ammonia burning internal combustion engineASO KOJI·Filed 2010·Granted Jun 18, 2013·10 cites·8 claims
- 0489US11047288B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Jun 29, 2021·2 cites·1 claims
- 0587US9249740B2Control device for internal combustion engineMATSUDA KAZUHISA·Filed 2012·Granted Feb 2, 2016·11 cites·10 claims
- 0681US8613219B2Catalyst abnormality diagnosis apparatusKITAURA KOICHI·Filed 2010·Granted Dec 24, 2013·11 cites·4 claims
- 0780US9624811B2Control device of internal combustion engineTOYOTA MOTOR CO LTD·Filed 2014·Granted Apr 18, 2017·4 cites·12 claims
- 0878US9611776B2Deterioration diagnosis device for an exhaust gas purification apparatusTOYOTA MOTOR CO LTD·Filed 2015·Granted Apr 4, 2017·2 cites·4 claims
- 0977US7474956B2Air-fuel ratio control system of internal combustion engineTOYOTA MOTOR CO LTD·Filed 2006·Granted Jan 6, 2009·9 cites·25 claims
- 1076US2022034252A1Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2021·Application pending·0 cites
- 1176US2022034251A1Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2021·Application pending·0 cites
- 1274US11286837B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Mar 29, 2022·0 cites·2 claims
- 1374US11261777B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Mar 1, 2022·0 cites·9 claims
- 1474US11255246B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Feb 22, 2022·0 cites·8 claims
- 1574US11236658B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Feb 1, 2022·0 cites·8 claims
- 1674US11215103B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Jan 4, 2022·0 cites·13 claims
- 1774US11199119B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Dec 14, 2021·0 cites·10 claims
- 1874US7729847B2Air-fuel ratio control device of internal combustion engineTOYOTA MOTOR CO LTD·Filed 2007·Granted Jun 1, 2010·6 cites·7 claims
- 1972US12473852B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2024·Granted Nov 18, 2025·0 cites·4 claims
- 2072US11149616B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Oct 19, 2021·0 cites·9 claims
- 2172US11105248B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Aug 31, 2021·0 cites·8 claims
- 2272US9506412B2Control apparatus for internal combustion engineTSUKAGOSHI TAKAHIRO·Filed 2011·Granted Nov 29, 2016·3 cites·2 claims
- 2372US7861514B2Method and device for detecting deterioration of catalystTOYOTA MOTOR CO LTD·Filed 2006·Granted Jan 4, 2011·6 cites·13 claims
- 2471US11149615B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2019·Granted Oct 19, 2021·0 cites·16 claims
- 2571US9188072B2Air-fuel ratio control apparatus for an internal combustion engineTOMIMATSU MAKOTO·Filed 2010·Granted Nov 17, 2015·3 cites·20 claims
- 2671US2020370491A1Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Application pending·0 cites
- 2770US11105247B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Aug 31, 2021·0 cites·9 claims
- 2870US10072553B2Deterioration diagnosis apparatus for selective catalytic reduction catalystTOYOTA MOTOR CO LTD·Filed 2016·Granted Sep 11, 2018·1 cites·9 claims
- 2969US7469530B2Fuel cut control apparatus of internal combustion engineTOYOTA MOTOR CO LTD·Filed 2005·Granted Dec 30, 2008·8 cites·5 claims
- 3068US8122869B2Air-fuel ratio control system of a multi-cylinder internal combustion engineFUJIWARA TAKAHIKO·Filed 2007·Granted Feb 28, 2012·6 cites·6 claims
- 3166US7795174B2Catalyst for purifying exhaust gasesTOYOTA MOTOR CO LTD·Filed 2006·Granted Sep 14, 2010·1 cites·5 claims
- 3265US8712667B2Air-fuel ratio control apparatus for an internal combustion engineNAKANO TOMOHIRO·Filed 2009·Granted Apr 29, 2014·5 cites·19 claims
- 3365US8074441B2Apparatus and method for determining catalyst degradationFUJIWARA TAKAHIKO·Filed 2006·Granted Dec 13, 2011·5 cites·2 claims
- 3464US8899019B2Air-fuel ratio control apparatusONOE RYOTA·Filed 2010·Granted Dec 2, 2014·2 cites·16 claims
- 3563US9062622B2Air-fuel ratio control apparatusONOE RYOTA·Filed 2010·Granted Jun 23, 2015·2 cites·18 claims
- 3661US8423265B2Control system of internal combustion engineASO KOJI·Filed 2010·Granted Apr 16, 2013·1 cites·8 claims
- 3760US8230846B2Air-fuel ratio control device for internal combustion engineFUJIWARA TAKAHIKO·Filed 2008·Granted Jul 31, 2012·4 cites·7 claims
- 3860US7159388B2Air-fuel ratio control device for internal-combustion engineTOYOTA MOTOR CO LTD·Filed 2004·Granted Jan 9, 2007·10 cites·17 claims
- 3959US8266898B2Control apparatus for internal combustion engineFUJIWARA TAKAHIKO·Filed 2008·Granted Sep 18, 2012·4 cites·2 claims
- 4056US8240131B2Exhaust gas purifying apparatus for internal combustion engineFUJIWARA TAKAHIKO·Filed 2008·Granted Aug 14, 2012·3 cites·12 claims
- 4154US2025270965A1Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2024·Application pending·0 cites
- 4253US11067017B2Control device for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2020·Granted Jul 20, 2021·0 cites·8 claims
- 4352US5589883ACathode ray tube displayHITACHI LTD·Filed 1994·Granted Dec 31, 1996·15 cites·9 claims
- 4451US8406980B2Air-fuel ratio control device and air-fuel ratio control method for internal combustion engineNAKAGAWA NORIHISA·Filed 2008·Granted Mar 26, 2013·2 cites·6 claims
- 4550US2012023913A1Catalyst abnormality diagnosis apparatusYOSHIOKA MAMORU·Filed 2009·Application pending·0 cites
- 4646US5337090AVideo output circuit with wide bandwidth and low power consumption for high resolution displayHITACHI LTD·Filed 1992·Granted Aug 9, 1994·9 cites·9 claims
- 4746US2009094963A1Exhaust particulate matter measuring apparatusTOYOTA MOTOR CO LTD·Filed 2007·Application pending·0 cites
- 4846US2007169465A1Air-fuel ratio control apparatus for internal combustion engineTOYOTA MOTOR CO LTD·Filed 2006·Application pending·0 cites
- 4944US10066534B2Internal combustion engineTOYOTA MOTOR CO LTD·Filed 2016·Granted Sep 4, 2018·0 cites·11 claims
- 5044US2016319722A1Catalytic converter and method for designing the catalytic converterTOYOTA MOTOR CO LTD·Filed 2014·Application pending·0 cites
Showing the top 50 of 65 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →