US PATENT SUBCLASS 60 / 293
.~.~.~.~ Check valve feeds air to exhaust system

Current as of: June, 1999
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60 /   HD   POWER PLANTS

272  DF  INTERNAL COMBUSTION ENGINE WITH TREATMENT OR HANDLING OF EXHAUST GAS {18}
282  DF  .~ By means producing a chemical reaction of a component of the exhaust gas {13}
287  DF  .~.~ Condition responsive control of reactor feed, pressure, or by-pass {3}
291  DF  .~.~.~ Of or by pressure in reactor or of engine exhaust {2}
293.~.~.~.~ Check valve feeds air to exhaust system

DEFINITION

Classification: 60/293

(under subclass 291) Apparatus in which a valve responsive to the difference in pressure between that of the reactor and the atmosphere open to feed reactive air to the reactor when the pressure in the reactor is below atmospheric pressure.