US PATENT SUBCLASS 165 / DIG 332
.~.~ Coaxial ducts define air draft passage and annular passage for heat exchange fluid

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

DIG 327  DD  THERMOSYPHONIC HAVING VERTICAL AIR DRAFT PASSAGE {3}
DIG 331  DD  .~ Air draft passage confined entirely by heat transfer surface {2}
DIG 332.~.~ Coaxial ducts define air draft passage and annular passage for heat exchange fluid {1}
DIG 333  DD  .~.~.~> Including baffle {1}