Inventor
NAKAYAMA KATSUTOSHI
JP42 patents
⚠️ This page may combine multiple inventors who share the name “NAKAYAMA KATSUTOSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NGK SPARK PLUG CO
16 patentsUS5797383AAug 25, 1998
Dual polarity type ignition system for a spark plug group
NGK SPARK PLUG CO20 citations92
US8013504B2Sep 6, 2011
Spark plug for internal combustion engine and method for producing the spark plug
NGK SPARK PLUG CO9 citations84
US7150252B2Dec 19, 2006
Spark plug and internal combustion engine equipped with the spark plug
NGK SPARK PLUG CO14 citations79
US9263857B2Feb 16, 2016
Ignition system
NGK SPARK PLUG CO5 citations72
US8907552B2Dec 9, 2014
High-frequency plasma spark plug
NGK SPARK PLUG CO5 citations72
US9306374B2Apr 5, 2016
Spark plug
NGK SPARK PLUG CO3 citations71
US8354782B2Jan 15, 2013
Spark plug
NGK SPARK PLUG CO6 citations71
US8013503B2Sep 6, 2011
Spark plug for internal combustion engine having ground electrode with thick, thin and stepped portion and method for producing the spark plug
NGK SPARK PLUG CO5 citations63
US7906894B2Mar 15, 2011
Spark plug for internal combustion engine
NGK SPARK PLUG CO3 citations63
US7825572B2Nov 2, 2010
Spark plug
NGK SPARK PLUG CO4 citations63
US7703428B2Apr 27, 2010
Spark plug and internal combustion engine in which the spark plug is disposed
NGK SPARK PLUG CO3 citations63
US9246313B2Jan 26, 2016
Ignition system
NGK SPARK PLUG CO2 citations61
US7781949B2Aug 24, 2010
Spark plug
NGK SPARK PLUG CO4 citations60
US7821186B2Oct 26, 2010
Spark plug having specific configuration of center electrode with respect to outer electrode
NGK SPARK PLUG CO1 citations52
US9368942B2Jun 14, 2016
Ignition plug and ignition system
NGK SPARK PLUG CO0 citations41
US8928212B2Jan 6, 2015
Spark plug
NGK SPARK PLUG CO0 citations40
KATSURAYA KOHEI
8 patentsUS9035562B2May 19, 2015
Ignition plug and ignition apparatus
KATSURAYA KOHEI4 citations71
US8222803B2Jul 17, 2012
Spark plug and manufacturing method thereof
KATSURAYA KOHEI2 citations61
US8102106B2Jan 24, 2012
Spark plug and method of manufacturing the same
KATSURAYA KOHEI2 citations61
US9231382B2Jan 5, 2016
Plasma ignition device and plasma ignition method
KATSURAYA KOHEI0 citations51
US8471448B2Jun 25, 2013
High-frequency plasma spark plug
KATSURAYA KOHEI1 citations51
US8976504B2Mar 10, 2015
Ignition system and spark plug
KATSURAYA KOHEI0 citations40
US8946977B2Feb 3, 2015
Spark plug having fusion zone
KATSURAYA KOHEI0 citations40
US8629605B2Jan 14, 2014
Spark plug having shaped insulator
KATSURAYA KOHEI0 citations40
NAKAYAMA KATSUTOSHI
5 patentsUS8247740B2Aug 21, 2012
Spark plug, and its manufacturing method
NAKAYAMA KATSUTOSHI2 citations61
US8298030B2Oct 30, 2012
Spark plug manufacturing method, and spark plug
NAKAYAMA KATSUTOSHI0 citations40
US8624473B2Jan 7, 2014
Spark plug
NAKAYAMA KATSUTOSHI0 citations39
US8506341B2Aug 13, 2013
Method of manufacturing sparkplugs
NAKAYAMA KATSUTOSHI0 citations39
US8466608B2Jun 18, 2013
Spark plug and manufacturing method thereof
NAKAYAMA KATSUTOSHI0 citations39
SAKAYANAGI NOBUAKI
4 patentsUS8212463B2Jul 3, 2012
Spark plug and its manufacturing method
SAKAYANAGI NOBUAKI8 citations82
US8487520B2Jul 16, 2013
Spark plug and method of manufacturing the same
SAKAYANAGI NOBUAKI6 citations71
US8841827B2Sep 23, 2014
Spark plug with improved resistance to spark-induced erosion of the ground electrode tip
SAKAYANAGI NOBUAKI3 citations60
US8264131B2Sep 11, 2012
Spark plug
SAKAYANAGI NOBUAKI3 citations60