US PATENT SUBCLASS 29 / 890.039
.~.~ Sheet joined to sheet

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}
890.039.~.~ Sheet joined to sheet {2}
890.04  DF  .~.~.~> With inserted tubes
890.041  DF  .~.~.~> Utilizing bond inhibiting material {1}

DEFINITION

Classification: 29/890.039

Sheet joined to sheet:

(under subclass 890.03) Process wherein the heat exchanger device or boiler made comprises a plurality of broad generally flat members joined directly together.