US PATENT SUBCLASS 29 / 890.048
.~.~.~.~ Helically finned

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  DF  .~.~ Tube with heat transfer means {1}
890.046  DF  .~.~.~ Finned tube {4}
890.048.~.~.~.~ Helically finned

DEFINITION

Classification: 29/890.048

Helically finned:

(under subclass 890.046) Process wherein the heat exchanger or boiler has an elongated hollow generally cylindrical structure having spiral protuberances thereon for facilitating heat transfer.