.~.~ With gas or vapor circulation for contact with treated material {8}
226
.~.~.~ Tortuous gas or vapor path
DEFINITION
Classification: 34/226
(under subclass 218) Apparatus having means for causing the treating gas or vapor to move through the treating chamber in other than a rectilinear path (as a spiral, helical or zigzag path).
(1) Note. Complete the search on tortuous treating gas or vapor path in this class, subclasses 199, 203 and 209 and their indented subclasses, particularly subclasses 212, 215 through 217 and 223. In subclass 209 and indented subclasses the flow is through distinct material compartments.
