(under subclass 767) Process in which a change in pressure causes or aids in the separating of constituents.
(1) Note. Processes which involves the mere squeezing of an already formed filter cake belong in subclasses 770+. Processes which involve the use of vacuum to draw filtrate through a filter medium, utilize pressure to drive the prefilt through the filter medium, or where a mere change in pressure causes the separation, belong in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
703+, for processes in which the pressure change results in flotation.
CROSS-REFERENCE ART COLLECTIONS
The following subclasses are collections of published disclosures pertaining to various specified aspects of the liquid treating art which aspects do not form appropriate bases for subclasses in the foregoing classification (i.e., subclasses superior hereto in the schedule), wherein original copies of patents are placed on the basis of the type of process employed. These subclasses assist a search based on particular the liquid treated, material removed or desired result and may be of further assistance to the searcher, either as a starting point in searching this class or as an indication of further related fields of search inside or outside the class. Thus, there is here provided a further path of access for retrieval of a limited number of types of disclosures.
(1) Note. Disclosures are placed in these subclasses for their value as references and as leads to appropriate main or secondary fields of search, without regard to their original classification of their claimed subject matter.
(2) Note. The disclosures found in the following subclasses are examples, only, of the indicated subject matter, and in no instance do they represent the entire extent of the prior art.
(3) Note. Where a subclass is directed to a concept, do not cross here. For example, do not cross-reference a subclass 646 patent to subclass 927 or a subclass 688 patent to subclass 912.
