US PATENT SUBCLASS 166 / 127
.~.~.~ Spaced packer or plug seals

Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
118  DF  .~ With expanding anchor {12}
126  DF  .~.~ With controllable passage between central chamber and space below packer {2}
127.~.~.~ Spaced packer or plug seals

DEFINITION

Classification: 166/127

(under subclass 126) Devices in which there are packer or plug sealing portions spaced from each other as defined in subclass 191.