(under subclass 233) Apparatus in which the body of the digester structure is provided with means to permit the introduction of the stock material to be digested, or the delivery of the material after treatment within the digester.
(1) Note. This subclass does not provide for mere means to
permit recirculation of either material treated or the chemical treated material even though the material may be removed bodily from the digester. For such subject matter search subclass 248 below.
(2) Note. The mere provision of an inlet opening in the digester structure either with or without a closure member is not sufficient to classify the patent in this subclass where the patent in the absence of such opening would be classified elsewhere. Patents claiming this subject matter in the absence of other features classifiable here may be found in classes relating to vessels of general utility, such as Class 220, Receptacles, for example.
SEE OR SEARCH THIS CLASS, SUBCLASS:
52, for digestion processes including a step of charging and/or discharging the fibrous material.
236, and 237, for means for charging and discharging continuous digesters. 239+, for discharging means combination with recovery means.
241, for digesters having means for discharging material into another digester.
