Inventor · disambiguated record
Wataru Matsutani
Also filed as: MATSUTANI WATARU
60 granted patents·4 pending applications·1,125 citations·filing 1988–2013
99Inventor score
Top patents by PatentIndex Score
64 records- 0198US6533628B1Method of manufacturing spark plug and spark plugNGK SPARK PLUG CO·Filed 2000·Granted Mar 18, 2003·62 cites·10 claims
- 0297US6304022B1Spark plugNGK SPARK PLUG CO·Filed 1999·Granted Oct 16, 2001·90 cites·24 claims
- 0392US5461276AElectrode for a spark plug in which a firing tip is laser welded to a front end thereofNGK SPARK PLUG CO·Filed 1995·Granted Oct 24, 1995·49 cites·7 claims
- 0491US8382973B2Method and apparatus for controlling multi-gas sensorNGK SPARK PLUG CO·Filed 2010·Granted Feb 26, 2013·11 cites·5 claims
- 0590US7827954B2Plasma-jet spark plug control method and deviceNGK SPARK PLUG CO·Filed 2006·Granted Nov 9, 2010·14 cites·14 claims
- 0690US5998913ASpark plug with iridium-rhodium alloy discharge portionNGK SPARK PLUG CO·Filed 1998·Granted Dec 7, 1999·46 cites·20 claims
- 0788US6121719ASpark plug having a multi-layered electrodeNGK SPARK PLUG CO·Filed 1998·Granted Sep 19, 2000·43 cites·12 claims
- 0887US7714488B2Plasma jet spark plug and ignition system for the sameNGK SPARK PLUG CO·Filed 2006·Granted May 11, 2010·16 cites·21 claims
- 0986US7804232B2Spark plug with high durabilityNGK SPARK PLUG CO·Filed 2005·Granted Sep 28, 2010·6 cites·9 claims
- 1086US6597089B2Spark plug for internal combustion engineNGK SPARK PLUG CO·Filed 2000·Granted Jul 22, 2003·23 cites·8 claims
- 1186US6489709B1Captive spark plug gasketNGK SPARK PLUG CO·Filed 2000·Granted Dec 3, 2002·24 cites·19 claims
- 1286US6236148B1Spark plug with specific metal shell coatingNGK SPARK PLUG CO·Filed 2000·Granted May 22, 2001·18 cites·8 claims
- 1384US6664719B2Spark plugNGK SPARK PLUG CO·Filed 2002·Granted Dec 16, 2003·20 cites·17 claims
- 1483US5866973ASpark plug having a platinum tip on an outer electrodeNGK SPARK PLUG CO·Filed 1997·Granted Feb 2, 1999·35 cites·5 claims
- 1582US7164225B2Small size spark plug having side spark preventionNGK SPARK PLUG CO·Filed 2004·Granted Jan 16, 2007·18 cites·20 claims
- 1682US6864622B2Spark plugNGK SPARK PLUG CO·Filed 2002·Granted Mar 8, 2005·17 cites·4 claims
- 1782US6046532ASpark plugNGK SPARK PLUG CO·Filed 1998·Granted Apr 4, 2000·38 cites·20 claims
- 1881US5831377ASpark plug in use for an internal combustion engineNGK SPARK PLUG CO·Filed 1997·Granted Nov 3, 1998·33 cites·18 claims
- 1980US6724133B2Spark plug with nickel alloy electrode base materialNGK SPARK PLUG CO·Filed 2001·Granted Apr 20, 2004·18 cites·32 claims
- 2078US5607605ALaser welding device, a method of checking welding condition and a method of making a center electrode for a spark plugNGK SPARK PLUG CO·Filed 1995·Granted Mar 4, 1997·38 cites·4 claims
- 2178US5395273AMethod of making a ground electrode for a spark plugNGK SPARK PLUG CO·Filed 1993·Granted Mar 7, 1995·46 cites·7 claims
- 2277US7279827B2Spark plug with electrode including precious metalNGK SPARK PLUG CO·Filed 2004·Granted Oct 9, 2007·14 cites·11 claims
- 2377US6528929B1Spark plug with iridium-based alloy chipNGK SPARK PLUG CO·Filed 1999·Granted Mar 4, 2003·28 cites·4 claims
- 2476US8465636B2Ammonium gas sensorSUGAYA SATOSHI·Filed 2009·Granted Jun 18, 2013·5 cites·9 claims
- 2576US5461210AMethod of manufacturing a spark plug electrodeNGK SPARK PLUG CO·Filed 1994·Granted Oct 24, 1995·35 cites·10 claims
- 2675US6858975B1Spark plug having an oil film on an intermediate portion of the insulator or intermediate portion of the metallic shellNGK SPARK PLUG CO·Filed 1999·Granted Feb 22, 2005·26 cites·4 claims
- 2775US5793793ASpark plugNGK SPARK PLUG CO·Filed 1997·Granted Aug 11, 1998·26 cites·3 claims
- 2874US7382084B2Spark plug having a precious metal tipNGK SPARK PLUG CO·Filed 2004·Granted Jun 3, 2008·13 cites·14 claims
- 2974US6768249B1Spark plug and producing method thereforNGK SPARK PLUG CO·Filed 2000·Granted Jul 27, 2004·13 cites·16 claims
- 3073US8072125B2Spark plug for use in an internal-combustion engine with a bilayer ground electrodeTORII KAZUYOSHI·Filed 2007·Granted Dec 6, 2011·5 cites·8 claims
- 3173US5869921ASpark plug for internal combustion engine having platinum and iridium alloyed emissive tipsNGK SPARK PLUG CO·Filed 1997·Granted Feb 9, 1999·24 cites·3 claims
- 3272US4914343ASpark plug with counterelectrode having plural apertures in flat portion thereofNGK SPARK PLUG CO·Filed 1988·Granted Apr 3, 1990·29 cites·4 claims
- 3371US6710523B2Spark plug internal combustion engineNGK SPARK PLUG CO·Filed 2001·Granted Mar 23, 2004·13 cites·9 claims
- 3471US5448130ASpark plug electrode for use in internal combustion engineNGK SPARK PLUG CO·Filed 1994·Granted Sep 5, 1995·34 cites·9 claims
- 3570US6538365B2Metal member with chromate coat, spark plug with chromate coat and manufacturing methods thereofNGK SPARK PLUG CO·Filed 2001·Granted Mar 25, 2003·12 cites·8 claims
- 3669US7291961B2Spark plug having a specific structure of noble metal tip on ground electrodeNGK SPARK PLUG CO·Filed 2004·Granted Nov 6, 2007·9 cites·7 claims
- 3769US6166479ASpark plug having a spark discharge portion with a specific compositionNGK SPARK PLUG CO·Filed 1998·Granted Dec 26, 2000·24 cites·20 claims
- 3869US5497045ASpark plug having a noble metal electrode portionNGK SPARK PLUG CO·Filed 1993·Granted Mar 5, 1996·27 cites·3 claims
- 3968US7288879B2Spark plug having ground electrode including precious metal alloy portion containing first, second and third componentsNGK SPARK PLUG CO·Filed 2004·Granted Oct 30, 2007·10 cites·12 claims
- 4067US7122947B2Glow plug and spark plug, and manufacturing method thereforNGK SPARK PLUG CO·Filed 2004·Granted Oct 17, 2006·7 cites·7 claims
- 4167US5894186ASpark plug with igniting portion chip compositionNGK SPARK PLUG CO·Filed 1997·Granted Apr 13, 1999·20 cites·18 claims
- 4266US7859177B2Spark plug for internal-combustion enginesNGK SPARK PLUG CO·Filed 2006·Granted Dec 28, 2010·3 cites·9 claims
- 4366US6437493B2Glow plug and spark plug, and manufacturing method thereforNGK SPARK PLUG CO·Filed 2001·Granted Aug 20, 2002·5 cites·12 claims
- 4465US7550906B2Spark plug having a noble-metal chip and method for manufacturing the sameNGK SPARK PLUG CO·Filed 2005·Granted Jun 23, 2009·3 cites·11 claims
- 4564US6573641B2Spark plugNGK SPARK PLUG CO·Filed 2001·Granted Jun 3, 2003·9 cites·14 claims
- 4663US7847472B2Spark plug having noble metal tipNGK SPARK PLUG CO·Filed 2007·Granted Dec 7, 2010·2 cites·10 claims
- 4763US5736809AMethod of making a spark plug including laser welding a noble metal layer to a firing end of electrodeNGK SPARK PLUG CO·Filed 1996·Granted Apr 7, 1998·17 cites·2 claims
- 4862USRE41944EMethod for manufacturing noble metal electric discharge chips for spark plugsNGK SPARK PLUG CO·Filed 2008·Granted Nov 23, 2010·2 cites·7 claims
- 4959US7714489B2Spark plug including ground electrode with arcuately curved faceNGK SPARK PLUG CO·Filed 2006·Granted May 11, 2010·2 cites·11 claims
- 5057US6688932B2Method for manufacturing spark plug and caulking metallic moldNGK SPARK PLUG CO·Filed 2002·Granted Feb 10, 2004·3 cites·13 claims
Showing the top 50 of 64 patent records by PatentIndex Score.
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