US PATENT SUBCLASS 423 / 212
.~ Mixture is exhaust from internal-combustion engine

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

210  DF  MODIFYING OR REMOVING COMPONENT OF NORMALLY GASEOUS MIXTURE {11}
212.~ Mixture is exhaust from internal-combustion engine {1}
213.2  DF  .~.~> Utilizing as solid sorbent, catalyst, or reactant a material containing a transition element {2}

DEFINITION

Classification: 423/212

(under subclass 210) Processes in which the initial gaseous mixture is the exhaust from an internal combustion engine.

SEE OR SEARCH CLASS

60, Power Plants,

272, 308 for exhaust gas treatment in cooperation with engine function.

422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,

168+, for apparatus for purifying exhaust gases from an internal combustion engine in which apparatus a catalyst is employed.