US PATENT SUBCLASS 166 / 142
.~ With controllable passage between central chamber and space below packer

Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
142.~ With controllable passage between central chamber and space below packer {7}
143  DF  .~.~> Central conduit detachable {1}
145  DF  .~.~> Bypass closing and passage opening to upward flow constrained to occur simultaneously
146  DF  .~.~> Passage connects with space below packers and continuously open passageway connects with space between packers
147  DF  .~.~> Passage connects with space between packer or plug seals
148  DF  .~.~> Upwardly biased check valve and means for opening or bypassing it
149  DF  .~.~> With passageway between central chamber and space above packer {2}
152  DF  .~.~> Passage controllable by movement of central chamber

DEFINITION

Classification: 166/142

(under subclass 179) Devices under the class definition comprising (1) a packer constructed to be supported from the

top of the well by a central conduit for insertion thereby into the well or (2) a packer as defined in subclass 179 for use with a centrally positioned receptacle as defined in subclass 162, there being a fluid passage between the central conduit or receptacle and the space below the packer outside of the conduit or receptacle, fluid flow through said passage being capable of being altered or affected by a valve, closure device or changeable restriction in subclass 224 positioned across the passage.

(1) Note. The passage may include as a part thereof any space inside of the surrounding conduit which receives the packer.

(2) Note. A packer is considered to bound a space even if unexpanded.

(3) Note. The central conduit or receptacle forms a central chamber for the purpose of receiving or discharging fluid, as for example, in sampling, cementing or washing devices.

SEE OR SEARCH THIS CLASS, SUBCLASS:

126+, for devices as defined in this subclass which also comprise expanding anchor means. SEE OR SEARCH CLASS

417, Pumps,

526, 528, and 547, for piston connected to a hollow piston rod which acts as a discharge conduit.