US PATENT SUBCLASS 122 / 261
.~.~ Volute

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}
260  DF  .~ Flat {1}
261.~.~ Volute

DEFINITION

Classification: 122/261

(under subclass 260) Devices in which the tubes are coiled about a central axis, each winding being spaced apart.

SEE OR SEARCH THIS CLASS, SUBCLASS:

134, for volute fire tube boilers.