US PATENT SUBCLASS 122 / 90
.~.~ Water firebox

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}
90.~.~ Water firebox {8}
*  DD  .~.~.~> Firebox water heater {1}
92  DF  .~.~.~> Magazine
93  DF  .~.~.~> Offset {1}
95.1  DF  .~.~.~> Plural with common combustion chamber {1}
96  DF  .~.~.~> Superposed
*  DD  .~.~.~> Water grate {2}
*  DD  .~.~.~> Water tube {1}
*  DD  .~.~.~> Water tube type {1}

DEFINITION

Classification: 122/90

(under subclass 51) Devices having a water firebox that are not otherwise classified.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50, for horizontal or inclined fire tube boilers having a large flue for the firebox.

58+, for horizontal fire tube boilers with drop water fireboxes.

73, for horizontal fire tube boilers with the barrel of the boiler projecting into the firebox, which is of the drop water firebox type.

74, and 75+, for return fire tube boilers with water fireboxes. 107, for water walls with drop water fireboxes.

139, and 141, for water fireboxes with other types of horizontal flue boilers.

149, for boilers having a large flue, with a water firebox.

189, 193+, for water fireboxes for horizontal cylindrical boilers which may or may not have horizontal fire tubes.