US PATENT SUBCLASS 422 / 169
.~.~ Including means providing sequential purification stages

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.~.~ Including means providing sequential purification stages {1}
170  DF  .~.~.~> Plural chemical reaction stages {2}

DEFINITION

Classification: 422/169

Including means providing sequential purification stages:

(under subclass 168) Apparatus having means for subjecting the waste gas to multiple, succeeding purification stages, at least one being of the chemical reaction type.