(under subclass 734) Device having means to heat the fuel prior to the point where it exits the injector and enters the combustion zone.
(1) Note. Preheating a mixture of fuel and air downstream of the fuel injector is excluded from this subclass. See subclass 738.
SEE OR SEARCH CLASS
431, Combustion,
161+, for combustion devices of general utility wherein fuel for the device is heated by heat generated by the device; and subclasses 207+ for combustion devices of general utility having a flame holder and means to heat fuel supplied to the flame holder.