(under subclass 179) Devices comprising means for blocking the flow of fluid either up or down or both in a surrounding well conduit by completely filling the bore of the conduit.
(1) Note. The essential elements for filling the bore should be claimed. For example, if a central support member for a deformable seal is disclosed as a solid rod and the support member is claimed classification is in this subclass. However, if a central support member is disclosed as a pipe which is closed off at one end with a deformable or other sealing portion claimed, classification is based on other characteristics of the device if subclasses are provided for such characteristics since the device as claimed is
indistinguishable from a packer.
(2) Note. The plug member as a whole may be adapted to be drilled up or otherwise destroyed. If only a central portion is destroyed or is intended to be destroyed first the device is classifiable in subclass 188.
SEE OR SEARCH THIS CLASS, SUBCLASS:
117, for plugs formed by leaving a receptacle as defined in subclass 162 or part thereof in the well.
132, and 135, for plugs combined with expanding anchor means. 153+, for pistons, fluid driven into the well.
187, for plugs expanded by fluid from a central conduit, pump or plunger.
SEE OR SEARCH CLASS
102, Ammunition and Explosives,
301+, for well torpedoes with plugging means; and subclass 333 for plugs used in blasting.
138, Pipes and Tubular Conduits,
89, for pipe closures and plugs of general utility, including those placed in a well conduit before the conduit is lowered into the well.
