US PATENT SUBCLASS 122 / 362
.~.~.~ Concentric tube

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

235.11  DF  WATER TUBE {52}
*  DD  .~ Headers {1}
360  DF  .~.~ Closures and couplings {4}
362.~.~.~ Concentric tube

DEFINITION

Classification: 122/362

(under subclass 360) Subject matter comprising the structure of the header and tube connections of specific application for a water tube boiler when two tubes concentrically arranged are coupled to a header.

SEE OR SEARCH CLASS

159, Concentrating Evaporators.