US PATENT SUBCLASS 123 / 443
.~ Alternate or simultaneous lean-rich

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

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
443.~ Alternate or simultaneous lean-rich

DEFINITION

Classification: 123/443

Alternate or simultaneous lean-rich:

(under subclass 434) Subject matter in which the charge-forming device alternately or simultaneously supplies rich mixture to some of the engine cylinders and lean mixture to the remaining engine cylinders.

(1) Note. This subclass also includes those charge-forming devices which switch from a lean or rich mixture to all cylinders to a lean or rich mixture to less than all cylinders.