US PATENT SUBCLASS 122 / 58 FB
.~.~.~ Fire box construction

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
58 R  DF  .~.~ Drop water firebox {11}
58 FB.~.~.~ Fire box construction

Unofficial Alpha Subclasses: R FB

DEFINITION

Classification: 122/58

(under subclass 51) Devices having a water firebox united to and extending below the main body of the boiler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

73, 74 and 76+, for return fire tube horizontal fire tube boilers with drop water fireboxes.

107, for horizontal fire tube boilers with water walls having a drop water firebox.

139, 141 and 146, for horizontal large flue boilers with drop water fireboxes.