US PATENT SUBCLASS 432 / 144
.~.~.~.~ Having structure circulating work atmosphere along or across path

Current as of: June, 1999
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432 /   HD   HEATING

120  DF  WORK CHAMBER HAVING HEATING MEANS {12}
121  DF  .~ Having means by which work is progressed or moved mechanically {9}
136  DF  .~.~ Combustion products generated in or fed to chamber {4}
143  DF  .~.~.~ Having means forming work path from inlet to outlet {5}
144.~.~.~.~ Having structure circulating work atmosphere along or across path {1}
145  DF  .~.~.~.~.~> Distinct blowers or blower discharge ports along path

DEFINITION

Classification: 432/144

(under subclass 143) Apparatus including structure by which heating gases are withdrawn from the work path and readmitted to the path at a different point.