US PATENT SUBCLASS 165 / DIG 327
THERMOSYPHONIC HAVING VERTICAL AIR DRAFT PASSAGE


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

DIG 327THERMOSYPHONIC HAVING VERTICAL AIR DRAFT PASSAGE {3}
DIG 328  DD  .~> Air draft passage confined entirely or in part by fin structure {2}
DIG 331  DD  .~> Air draft passage confined entirely by heat transfer surface {2}
DIG 337  DD  .~> Heating or cooling means entirely surrounded by air draft passage forming casing {3}