US PATENT SUBCLASS 165 / DIG 406
.~.~.~.~ Helically or spirally shaped


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

DIG 355  DD  HAVING SEPARATE FLOW PASSAGE FOR TWO DISTINCT FLUIDS {7}
DIG 400  DD  .~ Shell enclosed conduit assembly {4}
DIG 401  DD  .~.~ Including tube support or shell-side flow director {5}
DIG 405  DD  .~.~.~ Extending in a longitudinal direction {7}
DIG 406.~.~.~.~ Helically or spirally shaped