US PATENT SUBCLASS 431 / 147
.~.~ Cover bars oxidizer from catalyst

Current as of: June, 1999
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431 /   HD   COMBUSTION

144  DF  BURNER CAP, COVER OR EXTINGUISHER {2}
146  DF  .~ Movably or removably mounted cover for flame holder {6}
147.~.~ Cover bars oxidizer from catalyst

DEFINITION

Classification: 431/147

(under subclass 146) Apparatus wherein the cover, when in closed position, prevents access of air to, and consequent ignition by, a catalyst.