Inventor
YAMADA SHIGEYASU
5 patents
Patents
5 patentsUS4949006AAug 14, 1990
Spark plug structure
NGK SPARK PLUG CO30 citations89
US4092558AMay 30, 1978
Long distance discharge gap type spark plug
NGK SPARK PLUG CO39 citations89
US4288714ASep 8, 1981
Spark plug for internal combustion engine
NGK SPARK PLUG CO7 citations72
US5204579AApr 20, 1993
Ceramic insulator for spark plug structure
NGK SPARK PLUG CO17 citations70
US4336477AJun 22, 1982
Spark plug
NGK SPARK PLUG CO6 citations59