(under subclass 242.1) End structure comprising the particular shape, design, construction, or configuration of the means at the terminus of a conduit for facilitating entry of the conduit into the well (e.g., cementing shoes).
SEE OR SEARCH THIS CLASS, SUBCLASS:
156, for casing shoes with stop means for pistons, fluid driven into the well.
157+, for screens with a washing point or shoe.
203, for conduit shoes specifically formed and claimed as packers.
222+, for shoes with nozzles for whirling or lateral discharge or projectable nozzles.
316+, for conduits with valves, closures or changeable restrictors, especially subclasses 327+ for shoes with check valves.
SEE OR SEARCH CLASS 175, Boring or Penetrating the Earth,
