US PATENT SUBCLASS 166 / 147
.~.~ Passage connects with space between packer or plug seals

Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
142  DF  .~ With controllable passage between central chamber and space below packer {7}
147.~.~ Passage connects with space between packer or plug seals

DEFINITION

Classification: 166/147

(under subclass 142) Devices in which the passage connects with the annular space between spaced packer or plug sealing

portions as defined in subclass 191.

SEE OR SEARCH THIS CLASS, SUBCLASS:

146, for devices in which the passage connects with a space below packers and a continuously open passageway connects with the space between the packers.