US PATENT SUBCLASS 285 / 123.12
.~.~.~ Including a seal

Current as of: June, 1999
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285 /   HD   PIPE JOINTS OR COUPLINGS

120.1  DF  HAVING PLURAL INDEPENDENT PATHS {4}
123.1  DF  .~ For concentric tubes or pipes (e.g., well casing or wellhead type) {4}
123.3  DF  .~.~ Having single suspended inner tube {3}
123.12.~.~.~ Including a seal {2}
123.13  DF  .~.~.~.~> Held by a means applied radially (e.g., set crew)
123.14  DF  .~.~.~.~> Compressed by tightening a bolt coaxial to tubing

DEFINITION

Classification: 285/123.12

Including a seal:

(under subclass 123.3) Subject matter including a packer or pack-off type device that prevents or minimizes the flow of a fluid.