US PATENT SUBCLASS 166 / 193
.~.~ Free falling type (e.g., dropped ball)

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.~.~ Free falling type (e.g., dropped ball) {1}
194  DF  .~.~.~> With sleeve valve

DEFINITION

Classification: 166/193

(under subclass 192) Devices comprising an element which does not closely contact the conduit wall and is intended to be dropped or floated down the surrounding conduit (rather than let down by a supporting string) till it strikes a shoulder on the conduit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

153+, for piston devices which closely engage the conduit wall and are forced down by fluid pressure.