US PATENT SUBCLASS 166 / 194
.~.~.~ With sleeve valve

Current as of: June, 1999
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166 /   HD   WELLS

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

DEFINITION

Classification: 166/194

(under subclass 193) Devices comprising a sleeve portion which is moved by the plug or is moved due to fluid pressure or other means made effective by the presence of the plug, the sleeve portion being carried by the surrounding conduit and acting to open or close ports in the conduit walls for fluid passage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

154, for conduit valves operated by a piston, fluid driven into the well,