US PATENT SUBCLASS 29 / 890.043
.~.~ Tube joint and tube plate structure

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}
890.043.~.~ Tube joint and tube plate structure {1}
890.044  DF  .~.~.~> Including conduit expansion or inflation

DEFINITION

Classification: 29/890.043

Tube joint and tube plate structure:

(under subclass 890.03) Process wherein the heat exchanger or boiler is made by joining elongated hollow generally cylindrical members to one another or to associated heat exchanger members.

(1) Note. Tube sheet structure is quite different and distinct from tube plate structure. A tube sheet has longitudinal passageway therein, whereas a tube plate has traverse passageways therethrough.