US PATENT SUBCLASS 29 / 890.045
.~.~ Tube with heat transfer means


Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
890.03  DF  .~ Heat exchanger or boiler making {15}
890.045.~.~ Tube with heat transfer means {1}
890.046  DF  .~.~.~> Finned tube {4}


DEFINITION

Classification: 29/890.045

Tube with heat transfer means:

(under subclass 890.03) Process wherein the heat exchanger or boiler has an elongated hollow generally cylindrical member having features especially adapted for transferring thermal energy.