US PATENT SUBCLASS 122 / 44.1
FIRE TUBE

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

44.1FIRE TUBE {11}
44.2  DF  .~> With baffle in flue
49  DF  .~> Horizontal and vertical
*  DD  .~> Horizontal or inclined {1}
51  DF  .~> Horizontal {22}
109  DF  .~> Inclined
*  DD  .~> Transverse {3}
114  DF  .~> Vertical {13}
134  DF  .~> Volute
46  DF  .~> Magazine
*  DD  .~> Flue {2}
45  DF  .~> Fluid fuel

DEFINITION

Classification: 122/44.1

FIRE TUBE:

(under the class definition) Boilers having fire tubes not otherwise classifiable.

(1) Note. The term "fire tube" is used in a sense broad enough to include both small tubes and large tubes forming passages through a chamber when the size of the tube is immaterial to the invention claimed; but patents disclosing boilers provided with large fire tubes or "flues", where the large size of the tubes is a material feature of the structure and is necessary to the structure of the boiler and its combination with other features, are classified under the "flue" types of boilers, subclass 135, and the subclasses thereunder, except in that type of boiler where the large fire tube or flue be a subsidiary feature of the boiler, which is manifestly of the small fire tube type, in which case it is classified under the fire tube subclasses. See for example, this class, subclasses 47, 48, 50, and 78.

(2) Note. When a large flue in a boiler is essential to the structure and is not a mere subsidiary feature, such patents are classified in the "flue" type of boiler, although small fire tubes are an essential part of the combination, except those type classified in this class, subclasses 47 and 48.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37, for boilers having separate compartments having fire tubes.

42+, for miscellaneous combinations of fire tube and water tube boilers, but only those that are not specially provided for in the combination fire tube and water tube subclasses under the fire tube or the flue type.

191, through 207, inclusive, under horizontal cylinder, for

horizontal cylindrical boilers having water heating structures consisting of water tubes, drums, water walls, and water chambers of various forms, in combination with the boiler or being of such a configuration as to adapt it for use with a horizontal cylindrical boiler provided fire tubes are not essential to the boiler.