Kenichi Kumagai

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Patents Grantslast 30 patents

Information Patent Grant
Spark plug for internal combustion engine
- Patent number 8,288,928
- Issue date Oct 16, 2012
- NGK Spark Plug Co., Ltd.
- Kenichi Kumagai
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Spark plug for internal combustion engine
- Patent number 7,825,571
- Issue date Nov 2, 2010
- NGK Spark Plug Co., Ltd.
- Kenichi Kumagai
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Spark plug with high durability
- Patent number 7,804,232
- Issue date Sep 28, 2010
- NGK Spark Plug Co., Ltd.
- Kenichi Kumagai
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Spark plug
- Patent number 7,741,763
- Issue date Jun 22, 2010
- NGK Spark Plug Co., Ltd.
- Kenichi Kumagai
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Spark plug
- Patent number 6,759,795
- Issue date Jul 6, 2004
- NGK Spark Plug Co., Ltd.
- Kenichi Kumagai
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Spark plug and method of producing spark plug
- Patent number 6,603,244
- Issue date Aug 5, 2003
- NGK Spark Plug Co., Ltd.
- Yoshihisa Sugiyama
- H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents

Information Patent Application
SPARK PLUG FOR INTERNAL COMBUSTION ENGINE
- Publication number 20110012500
- Publication date Jan 20, 2011
- NGK SPARK PLUG CO., LTD.
- Kenichi Kumagai
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Spark Plug
- Publication number 20080278053
- Publication date Nov 13, 2008
- Kenichi Kumagai
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Application
SPARK PLUG
- Publication number 20080054778
- Publication date Mar 6, 2008
- NGK SPARK PLUG CO., LTD.
- Kenichi KUMAGAI
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Spark plug for internal combustion engine
- Publication number 20060170320
- Publication date Aug 3, 2006
- NGK SPARK PLUG CO., LTD.
- Kenichi Kumagai
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Spark plug for use in internal combustion engine
- Publication number 20040080252
- Publication date Apr 29, 2004
- NGK SPARK PLUG CO., LTD.
- Satoko Ito
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Spark plug
- Publication number 20030178925
- Publication date Sep 25, 2003
- NGK SPARK PLUG CO., LTD.
- Kenichi Kumagai
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Spark plug and method of producing spark plug
- Publication number 20020158559
- Publication date Oct 31, 2002
- NGK SPARK PLUG CO., LTD.
- Yoshihisa Sugiyama
- H01 - BASIC ELECTRIC ELEMENTS