US PATENT SUBCLASS 362 / 171
.~.~ Tubular type

Current as of: June, 1999
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362 /   HD   ILLUMINATION

157  DF  SELF POWERED LAMP {16}
159  DF  .~ Nonelectric {9}
171.~.~ Tubular type {4}
172  DF  .~.~.~> Base structure
173  DF  .~.~.~> Dome structure
174  DF  .~.~.~> Relatively movable modifier {3}
178  DF  .~.~.~> Tube structure

DEFINITION

Classification: 362/171

(under subclass 159) Subject matter wherein a portion of the products of combustion is led back to the flame or in which the air, or a portion thereof, for combustion is preheated by the combustion.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

79, for heating stoves that are provided with means for returning the gases or products of combustion from the smoke outlet to the combustion chamber of the stove.

431, Combustion,

104+, for a mantle-type burner in which the fuel is heated by the products of combustion, and subclass 215 for a burner in which the exhaust products heat the burner fuel.