US PATENT SUBCLASS 123 / 555
.~.~ Air and fuel heated separately

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
543  DF  .~ Heating of combustible mixture {13}
555.~.~ Air and fuel heated separately

DEFINITION

Classification: 123/555

Air and fuel heated separately:

(under subclass 543) Subject matter having means wherein the air alone and fuel alone are heated separately before they are mixed.