US PATENT SUBCLASS 122 / 160
.~.~ Concentric shell


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

135.1  DF  FLUE {4}
155.1  DF  .~ Vertical {16}
160.~.~ Concentric shell {2}
161  DF  .~.~.~> Fluid fuel
162  DF  .~.~.~> Central magazine


DEFINITION

Classification: 122/160

(under subclass 155) Vertical flue boilers comprising a plurality of concentrically posited annular water shells formed of walls spaced apart.

SEE OR SEARCH THIS CLASS, SUBCLASS:

158, for special forms of this type of boiler.