US PATENT SUBCLASS 123 / 553
.~.~ Intermediate fluid used for heating

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}
553.~.~ Intermediate fluid used for heating

DEFINITION

Classification: 123/553

Intermediate fluid used for heating:

(under subclass 543) Subject matter in which the source of heat is used to heat an intermediate fluid (other than engine coolant, lubricant, or exhaust gas) that is in heat transfer relationship with the fuel, air, combustible mixture, or charge-forming device.