US PATENT SUBCLASS 166 / 86.2
.~.~ Annular sealing type valve

Current as of: June, 1999
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166 /   HD   WELLS

75.11  DF  ABOVE GROUND APPARATUS {25}
86.1  DF  .~ Inner member anchor or seal with valve {3}
86.2.~.~ Annular sealing type valve

DEFINITION

Classification: 166/86.2

Annular sealing type valve:

(under subclass 86.1) Inner member seal with valve wherein the flow regulating device controls flow through the annulus defined between the pipe, rod, tubing, or wireline and casing.