US PATENT SUBCLASS 165 / DIG 512
.~ Coated heat transfer surface

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

DIG 510  DD  HAVING HEAT EXCHANGE SURFACE TREATMENT, ADJUNCT OR ENHANCEMENT {7}
DIG 512.~ Coated heat transfer surface {2}
DIG 513  DD  .~.~> Corrosion resistant
DIG 514  DD  .~.~> Hydrophilic/hydrophobic coating