Inventor
KATOH AKIO
JP7 patents
Patents
7 patentsUS5990602ANov 23, 1999
Long life spark plug having minimum noble metal amount
NIPPON DENSO CO47 citations92
US5563468AOct 8, 1996
Spark plug having arc-shaped precious metal chip and method of producing the same
NIPPON DENSO CO23 citations92
US5502351AMar 26, 1996
Spark plug having horizontal discharge gap
NIPPON DENSO CO33 citations92
US5502994AApr 2, 1996
Method for producing a metal tip
NIPPON DENSO CO26 citations90
US5465022ANov 7, 1995
Spark plug for internal-combustion engine and manufacture method of the same
NIPPON DENSO CO50 citations90
US5502352AMar 26, 1996
Spark plug having horizontal discharge
NIPPON DENSO CO11 citations73
US5406166AApr 11, 1995
Long life spark plug having consumable discharge member
NIPPON DENSO CO15 citations73