US PATENT SUBCLASS 502 / 49
.~.~.~ Plural distinct oxidation stages

Current as of: June, 1999
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502 /   HD   CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING

20  DF  REGENERATING OR REHABILITATING CATALYST OR SORBENT {4}
34  DF  .~ Gas or vapor treating {5}
38  DF  .~.~ Treating with free oxygen containing gas {8}
49.~.~.~ Plural distinct oxidation stages

DEFINITION

Classification: 502/49

Plural distinct oxidation stages:

(under subclass 38) Process including a second treatment of the spent material with an oxidizing agent differing in either location or reaction condition.

(1) Note. Recitation of two or more stages differing in temperature, pressure, or oxygen content is considered to indicate plural distinct stages.

SEE OR SEARCH THIS CLASS, SUBCLASS:

41+, for a similar plural stage oxidation process using a fluidized bed.

50, for a second reactive gas treatment other than oxidation (e.g., reduction, replacement etc.).