US PATENT SUBCLASS 123 / 568.14
.~.~ Internal exhaust gas recirculation (e.g., exhaust gas retained in the combustion chamber)

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

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
568.11  DF  .~ Exhaust gas used with the combustible mixture (e.g., emission control Exhaust Gas Recirculation (EGR) valve) {10}
568.14.~.~ Internal exhaust gas recirculation (e.g., exhaust gas retained in the combustion chamber)

DEFINITION

Classification: 123/568.14

Internal exhaust gas recirculation (e.g., exhaust gas retained in the combustion chamber):

(under subclass 568.11) Subject matter including means to cause a portion of the products of combustion either (a) to remain in the combustion chamber after the combustible mixture has been burned or (b) to be drawn back into the combustion chamber from either (1) the intake passage or (2) the exhaust passage.

(1) Note. All engines will retain a portion of the products of combustion within the combustion chamber after combustion however, the subject matter included herein is designed to cause more of the products to remain.