(under subclass 233) Apparatus having means to maintain the stock material undergoing digestion in a state of motion.
(1) Note. The circulation is usually for the purpose of insuring intimate contact of the material with the chemical treating agent.
(2) Note. This subclass includes forced circulation of the material being digested, but does not include mere forced circulation of the digestion fluid through the material being digested. For the latter subject matter see subclass 248
below.
(3) Note. This subclass does not include circulation caused by heating alone. For such subject matter see subclass 250 below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
234+, for apparatus in which the circulating means causes substantial defibering of the stock material. 248, and see (2) Note above.
