US PATENT SUBCLASS 432 / 21
.~.~ Including recycling work atmosphere

Current as of: June, 1999
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432 /   HD   HEATING

1  DF  PROCESSES OF HEATING OR HEATER OPERATION {14}
19  DF  .~ Controlling flame position or work atmosphere {7}
21.~.~ Including recycling work atmosphere

DEFINITION

Classification: 432/21

(under subclass 19) Process in which the atmosphere is controlled by recycling withdrawn material back to the work zone.

SEE OR SEARCH CLASS

431, Combustion,

9, for a combustion process involving whirling, recycling material, or reversing flow in an enclosed flame zone.