(under subclass 227) Devices under the class definition comprising a conduit comprising a screen in combination with a means at the end of the conduit comprising a structure having a port for conducting fluid outwardly of the end of the conduit usually to wash the screen.
SEE OR SEARCH THIS CLASS, SUBCLASS:
327+, for conduit shoes with check valves (usually disclosed for floating in and cementing a casing).
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth,
314, for earth boring apparatus, including a jetting point, combined with a well type screen.
