US PATENT SUBCLASS 166 / 121
.~.~.~ Pressure transmitted by cup type packer or plug seal

Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
118  DF  .~ With expanding anchor {12}
120  DF  .~.~ Anchor actuated by fluid pressure {2}
121.~.~.~ Pressure transmitted by cup type packer or plug seal

DEFINITION

Classification: 166/121

(under subclass 120) Devices wherein the fluid pressure for moving the anchoring means is exerted on a cup type packer sealing portion of the type defined in subclass 202.