US PATENT SUBCLASS 110 / 324
.~.~ Having concavity for engaging pipe exterior


Current as of: June, 1999
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110 /   HD   FURNACES

322  DF  BAFFLE OR HEAT RETAINER STRUCTURE {2}
323  DF  .~ Refractory type {1}
324.~.~ Having concavity for engaging pipe exterior {1}
325  DF  .~.~.~> And structure to bridge pipes


DEFINITION

Classification: 110/324

Having concavity for engaging pipe exterior:

(under subclass 323) Structure wherein the refractory structure is provided with a negatively curved area adapted to mate with the external surface of a boiler tube.