(under the class definition) Devices comprising a central conduit or centrally positioned receptacle in combination with a surrounding conduit, the surrounding conduit being prepositioned in final position in the earth before the central conduit or receptacle is associated therewith, there being a means sealing a portion of the annular space between the central conduit or receptacle and the surrounding conduit.
(1) Note. For classification in this subclass a patent must claim the surrounding conduit which may even be the earth wall of the well, with some particularity. For example, the mere naming of a conduit or a conduit with a perforation or group of perforations is not enough, but the recitation of spaced perforations or groups of perforations is sufficient. A mere functional claiming of a relationship is not enough. See the search notes for devices having a particular relationship with a surrounding conduit.
(2) Note. The sealing means of the definition is usually a packer carried by the central conduit or receptacle.
(3) Note. A broadly recited pump barrel is not considered a central conduit or receptacle. Devices comprising a pump barrel with a packer cooperating with a shoulder in a surrounding conduit may be found in subclasses 195 and 203.
SEE OR SEARCH THIS CLASS, SUBCLASS:
114, for a central chamber with a packer or plug combined with a preset packer or plug whose setting means has been withdrawn. 136, for packers or plugs with expanding anchors where the expanding anchor is spring set and adapted to engage in a recess in the surrounding conduit.
195, for deformable packers adapted to engage a shoulder on a surrounding conduit.
203, for nondeformable packers adapted to engage a shoulder on a surrounding conduit.
