US PATENT SUBCLASS 34 / 549
.~.~ Of heater

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
524  DF  .~ With automatic control {11}
549.~.~ Of heater {7}
550  DF  .~.~.~> Sensor engages material
551  DF  .~.~.~> Having burner control
552  DF  .~.~.~> By steam pressure or temperature
553  DF  .~.~.~> Electric heater
554  DF  .~.~.~> Of heater blower
555  DF  .~.~.~> With means to remove excess heat
556  DF  .~.~.~> By web or strand tension or breaking

DEFINITION

Classification: 34/549

Of heater:

(under subclass 524) Apparatus in which the action of the heating means is controlled.

(1) Note. Control of the pressure or flow of steam when used as an individual heating medium is treated as heater control.

(2) Note. Automatic heater cut-offs and starters are here.

(3) Note. Since a temperature change of a gas without changing the moisture content results in a change in the relative humidity, control of heating by humidostatic means is placed in this subclass (and not subclass 557) even though a change in humidity is the claimed result.

SEE OR SEARCH THIS CLASS, SUBCLASS:

119, and the notes thereto.

SEE OR SEARCH CLASS

237, Heating Systems, 9, and 10 for automatic control of a steam heating system.

432, Heating,

49, for the automatic control of heat generation or transmission in a material heating apparatus not specialized to drying or having a specific heat generator.