US PATENT SUBCLASS 123 / 648
.~ Having SCR triggered by lowering cathode voltage below ground

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123 /   HD   INTERNAL-COMBUSTION ENGINES

594  DF  HIGH TENSION IGNITION SYSTEM {28}
648.~ Having SCR triggered by lowering cathode voltage below ground

DEFINITION

Classification: 123/648

Having SCR triggered by lowering cathode voltage below ground:

(under subclass 594) Subject matter wherein the ignition circuit uses a silicone control rectifier (SCR) to conduct the ignition coil primary current and wherein the SCR is triggered by lowering the cathode potential below ground (i.e., by applying a negative cathode potential).