.~ Reversible or pulsating treating gas or vapor flow
DEFINITION
Classification: 34/191
(under the class definition) Apparatus having either, or both, (1) means to cause the contact gas or vapor to pulsate, or (2) means to cause the contact gas or vapor to flow into contact with the material being treated first in one direction and then in an opposite direction at the same place.
(1) Note. This subclass does not include those apparatuses in which the treating gas or vapor flows in reverse directions in different places, for which see this class, subclasses 203+, 210 and other subclasses, particularly subclasses 223, 224, 225, 226, 230, and 232.
SEE OR SEARCH THIS CLASS, SUBCLASS:
92, 402+, and 558+, for sub- or superatmospheric treatment including varying such pressures.
222, and 229, for movable gas distributors.
463+, and notes, for processes involving gas or vapor flow directing or control.
562+, for such means combined with timing means, and subclass 54 for automatic control of the flow of treating gas or vapor. SEE OR SEARCH CLASS
