US PATENT SUBCLASS 166 / 192
.~ Flow stopping type; e.g., plug


Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
192.~ Flow stopping type; e.g., plug {1}
193  DF  .~.~> Free falling type (e.g., dropped ball) {1}


DEFINITION

Classification: 166/192

(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.

220, Receptacles,

233+, for expansible plug type closures.