US PATENT SUBCLASS 34 / 558
.~.~ Of gas or vapor pressure in treating enclosure

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}
558.~.~ Of gas or vapor pressure in treating enclosure {1}
559  DF  .~.~.~> Subatmospheric pressure

DEFINITION

Classification: 34/558

Of gas or vapor pressure in treating enclosure:

(under subclass 524) Apparatus in which the force of the gas or vapor within the treating chambers is controlled.

(1) Note. This subclass includes blow-out panels or valves opened by pressure, including pressure caused by fires or explosions.

SEE OR SEARCH CLASS

137, Fluid Handling,

494+, particularly subclasses 505+ for the fluid-pressure

regulator subcombination.