US PATENT SUBCLASS 165 / DIG 337
.~ Heating or cooling means entirely surrounded by air draft passage forming casing


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

DIG 327  DD  THERMOSYPHONIC HAVING VERTICAL AIR DRAFT PASSAGE {3}
DIG 337.~ Heating or cooling means entirely surrounded by air draft passage forming casing {3}
DIG 338  DD  .~.~> Nested or concentric members define annular air draft passage and heating or cooling conduit {1}
DIG 340  DD  .~.~> Including flow baffle in casing
DIG 341  DD  .~.~> Parallel heating or cooling tubes or tubular sections (e.g., coil, serpentine, etc.)