(under the class definition) Apparatus combined with means for separating solids from earth fluid flowing into a well conduit.
(1) Note. The means for separating solids is generally known as a well screen, strainer or filter and may comprise no more than a pipe with a multiplicity of perforations therein. The important factor determining classification in this subclass is the specific description of the use of the means to permit naturally occurring fluid in the earth formation to flow into a well conduit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
312, for devices combined with a receptacle for cuttings having a sieve or strainer.
320+, for tool shafts which may have holes to permit fluid circulation and subclass 324 in particular for means other than bit structure to induce fluent flow.
SEE OR SEARCH CLASS
166, Wells, 227+, and the search there noted, for well screens, per se, or for other combinations of well devices with screens.
