US PATENT SUBCLASS 122 / 342
.~.~.~ Spur tube upper drum

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

235.11  DF  WATER TUBE {52}
332  DF  .~ Vertical {10}
*  DD  .~.~ Annular lower drum {4}
342.~.~.~ Spur tube upper drum

DEFINITION

Classification: 122/342

(under subclass 332) Devices in which the water tubes communicate with an annular lower drum and an upper drum provided with spur water tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

341, and 343, for boilers of similar structure without the spur tubes on the upper drum.