US PATENT SUBCLASS 29 / 890.042
.~.~.~.~ With subsequent fluid expansion

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  DF  .~.~ Sheet joined to sheet {2}
890.041  DF  .~.~.~ Utilizing bond inhibiting material {1}
890.042.~.~.~.~ With subsequent fluid expansion

DEFINITION

Classification: 29/890.042

With subsequent fluid expansion:

(under subclass 890.041) Process herein the selectively bonded heat exchanger or boiler is pneumatically or hydraulically inflated.