Inventor · disambiguated record
Keiji Kanao
Also filed as: KANAO KEIJI
39 granted patents·6 pending applications·804 citations·filing 1993–2012
98Inventor score
Top patents by PatentIndex Score
45 records- 0195US6885135B2Spark plug and its manufacturing methodDENSO CORP·Filed 2002·Granted Apr 26, 2005·46 cites·21 claims
- 0295US6094000ASpark plug for internal combustion engineNIPPON DENSO CO·Filed 1996·Granted Jul 25, 2000·85 cites·22 claims
- 0394US6853116B2Structure of spark plug designed to provide higher durability and ignitability of fuelDENSO CORP·Filed 2002·Granted Feb 8, 2005·39 cites·20 claims
- 0494US6346766B1Spark plug for internal combustion engine and method for manufacturing sameDENSO CORP·Filed 1999·Granted Feb 12, 2002·65 cites·29 claims
- 0592US6307307B1Spark plug for internal combustion engine with Ir alloy molten portion outside spark discharge regionDENSO CORP·Filed 1999·Granted Oct 23, 2001·47 cites·4 claims
- 0691US6523515B2Spark plug for internal combustion engines and manufacturing method thereofDENSO CORP·Filed 2001·Granted Feb 25, 2003·31 cites·20 claims
- 0790US7250711B2Spark plug with increased durability and carbon fouling resistanceDENSO CORP·Filed 2005·Granted Jul 31, 2007·12 cites·19 claims
- 0890US6621198B2Spark plug having iridum alloy tip, iron-based alloy tip bonding portion and stress relieving layer therebetweenDENSO CORP·Filed 2001·Granted Sep 16, 2003·37 cites·15 claims
- 0990US6337533B1Spark plug for internal combustion engine and method for manufacturing sameDENSO CORP·Filed 1999·Granted Jan 8, 2002·50 cites·13 claims
- 1089US6653767B2Spark plug and ignition apparatusDENSO CORP·Filed 2001·Granted Nov 25, 2003·24 cites·8 claims
- 1188US6724132B2Spark plug for an engine for a cogeneration systemDENSO CORP·Filed 2001·Granted Apr 20, 2004·39 cites·7 claims
- 1288US6262522B1Spark plug for internal combustion engineDENSO CORP·Filed 1997·Granted Jul 17, 2001·45 cites·4 claims
- 1387US6831397B2Spark plug and a method of producing the sameDENSO CORP·Filed 2002·Granted Dec 14, 2004·24 cites·9 claims
- 1486US6844662B2Spark plug and ignition apparatusDENSO CORP·Filed 2003·Granted Jan 18, 2005·20 cites·2 claims
- 1585US7183702B2Spark plug with high insulation properties and high capability to ignite air-fuel mixtureNIPPON SOKEN·Filed 2005·Granted Feb 27, 2007·10 cites·24 claims
- 1682US6470845B2Spark plug for internal combustion engineDENSO CORP·Filed 2001·Granted Oct 29, 2002·19 cites·10 claims
- 1781US7554253B2Spark plug with increased durability and carbon fouling resistanceDENSO CORP·Filed 2005·Granted Jun 30, 2009·7 cites·12 claims
- 1877US5990602ALong life spark plug having minimum noble metal amountNIPPON DENSO CO·Filed 1993·Granted Nov 23, 1999·47 cites·2 claims
- 1974US7298070B2Compact structure of spark plug designed to ensure desired heat rangeDENSO CORP·Filed 2005·Granted Nov 20, 2007·5 cites·11 claims
- 2071US5557158ASpark plug and method of producing the sameNIPPON DENSO CO·Filed 1994·Granted Sep 17, 1996·34 cites·6 claims
- 2170US7224109B2Spark plugDENSO CORP·Filed 2005·Granted May 29, 2007·4 cites·18 claims
- 2265US5581145ASpark plugNIPPON DENSO CO·Filed 1994·Granted Dec 3, 1996·27 cites·4 claims
- 2364US7086363B2Spark plug and ignition apparatus using sameNIPPON SOKEN·Filed 2004·Granted Aug 8, 2006·7 cites·26 claims
- 2461US6885137B2Spark plug and its manufacturing methodDENSO CORP·Filed 2003·Granted Apr 26, 2005·8 cites·6 claims
- 2561US5693999AMultiple gap spark plug for internal combustion engineNIPPON DENSO CO·Filed 1996·Granted Dec 2, 1997·16 cites·25 claims
- 2657US8258686B2Spark plug for internal combustion engineKANAO KEIJI·Filed 2006·Granted Sep 4, 2012·2 cites·9 claims
- 2757US6373172B1Spark plug for internal combustion engine having a straight pillar ground electrodeDENSO CORP·Filed 1999·Granted Apr 16, 2002·15 cites·19 claims
- 2856US7282844B2High performance, long-life spark plugNIPPON SOKEN·Filed 2004·Granted Oct 16, 2007·6 cites·21 claims
- 2956US7267116B2Spark plug and ignition apparatus using sameNIPPON SOKEN·Filed 2002·Granted Sep 11, 2007·5 cites·30 claims
- 3056US7122948B2Spark plug having enhanced capability to ignite air-fuel mixtureNIPPON SOKEN·Filed 2004·Granted Oct 17, 2006·6 cites·21 claims
- 3156US6700317B2Spark plug for an internal combustion engine and manufacturing method of the sameDENSO CORP·Filed 2001·Granted Mar 2, 2004·9 cites·5 claims
- 3255US6794804B2Production method of spark plug designed to provide high temperature oxidation resistance and weld strength and spark plug produced therebyDENSO CORP·Filed 2002·Granted Sep 21, 2004·5 cites·9 claims
- 3352US6819033B2Spark plug and method of manufacturing sameDENSO CORP·Filed 2002·Granted Nov 16, 2004·4 cites·10 claims
- 3451US7176608B2Spark plugDENSO CORP·Filed 2004·Granted Feb 13, 2007·4 cites·11 claims
- 3549US9039879B2Gas sensor and method of manufacturing thereofKANAO KEIJI·Filed 2008·Granted May 26, 2015·0 cites·10 claims
- 3649US7484402B2Gas sensorDENSO CORP·Filed 2006·Granted Feb 3, 2009·0 cites·4 claims
- 3748US8523624B2Spark plug for internal combustion engine and manufacturing method thereofKANAO KEIJI·Filed 2012·Granted Sep 3, 2013·0 cites·6 claims
- 3848US2007240485A1Gas sensor with increased sealing performanceDENSO CORP·Filed 2007·Application pending·0 cites
- 3948US2007193337A1Gas sensor with caulked portion for fixedly holding gas sensing element and method for producing the sameDENSO CORP·Filed 2007·Application pending·0 cites
- 4047US2007125649A1Gas sensorDENSO CORP·Filed 2006·Application pending·0 cites
- 4140US2006055298A1Spark plug for internal combustion engineDENSO CORP·Filed 2005·Application pending·0 cites
- 4239US7230369B2Spark plugDENSO CORP·Filed 2004·Granted Jun 12, 2007·0 cites·13 claims
- 4337US2004066124A1Spark plug with elastically and plastically improved gasketDENSO CORP·Filed 2003·Application pending·0 cites
- 4436US8449742B2Gas sensor and method of manufacturing sameKANAO KEIJI·Filed 2010·Granted May 28, 2013·0 cites·10 claims
- 4536US2001030494A1Ground electrode for spark plug, spark plug and method of manufacturing the sameFiled 2001·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Keiji Kanao files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →