US PATENT SUBCLASS 422 / 172
.~.~.~.~ And means downstream of a stage for injecting a reactant into waste gas for interreaction in subsequent stage

Current as of: June, 1999
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422 /   HD   CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING

129  DF  CHEMICAL REACTOR {28}
168  DF  .~ Waste gas purifier {5}
169  DF  .~.~ Including means providing sequential purification stages {1}
170  DF  .~.~.~ Plural chemical reaction stages {2}
172.~.~.~.~ And means downstream of a stage for injecting a reactant into waste gas for interreaction in subsequent stage

DEFINITION

Classification: 422/172

And means downstream of a stage for injecting a reactant into waste gas for interreaction in subsequent stage:

(under subclass 170) Apparatus having means located downstream of a reaction stage for injecting a reactant into the waste gas stream for reaction therewith in a subsequent reaction stage (e.g., a catalyst bed for reducing NOx in the waste gas followed by a catalyst bed for oxidizing CO in the waste gas, with means for injecting oxygen into the waste gas, as it passes between the two catalyst beds).