US PATENT SUBCLASS 166 / 130
.~.~.~ Packer expanded by upper valve

Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
118  DF  .~ With expanding anchor {12}
129  DF  .~.~ With controllable bypass outside central conduit {1}
130.~.~.~ Packer expanded by upper valve

DEFINITION

Classification: 166/130

(under subclass 129) Devices wherein the packer blocking portion is expanded laterally by means of force transmitted through coacting shoulder members which are situated above the packer and which act to close the fluid passage as they expand the packer blocking portion.