US PATENT SUBCLASS 122 / 424
.~.~.~ Exhaust pipe

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


122 /   HD   LIQUID HEATERS AND VAPORIZERS

412  DF  FEED HEATERS {17}
*  DD  .~ Horizontal fire tube boiler {2}
423  DF  .~.~ Smoke box {3}
424.~.~.~ Exhaust pipe

DEFINITION

Classification: 122/424

(under subclass 423) Subject matter comprising a water-jacketed exhaust "lift" pipe.