US PATENT SUBCLASS 122 / 149
.~.~ Return fire tube


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}
136 R  DF  .~ Horizontal {7}
149.~.~ Return fire tube {2}
150  DF  .~.~.~> Rear water tube
*  DD  .~.~.~> Water smoke box {1}


DEFINITION

Classification: 122/149

(under subclass 136) Devices having horizontally disposed small fire tubes, through which the products of combustion are returned through the boiler after leaving the large flues. The firebox is generally located in the large flues.

SEE OR SEARCH THIS CLASS, SUBCLASS:

47, for miscellaneous boilers having fire tubes with a horizontal flue.

74, 76 and 107, for related art in the fire tube type of boiler.

141, 146, 150, 151, and 410, for other types of horizontal flue boilers having return fire tubes.