US PATENT SUBCLASS 423 / 213.7
.~.~.~ Including successive stage treatments to modify or remove a different component in each stage

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  DF  .~ 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}
213.7.~.~.~ Including successive stage treatments to modify or remove a different component in each stage

DEFINITION

Classification: 423/213.7

(under subclass 213.2) Processes in which there are at least two serial treatments of the gaseous mixture, each treatment modifying or removing a component different than that affected by the other.