US PATENT SUBCLASS 285 / 123.1
.~ For concentric tubes or pipes (e.g., well casing or wellhead type)

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.~ For concentric tubes or pipes (e.g., well casing or wellhead type) {4}
123.2  DF  .~.~> Having plural parallel suspended inner tubes
123.3  DF  .~.~> Having single suspended inner tube {3}
123.15  DF  .~.~> Double-walled or duplex joint {1}
123.17  DF  .~.~> Joint fabricated from material to compensate for movement

DEFINITION

Classification: 285/123.1

For concentric tubes or pipes (e.g., well casing or wellhead type):

(under subclass 120.1) Subject matter comprising means mounting an inner tube in spaced relation to an outer tube.

SEE OR SEARCH THIS CLASS, SUBCLASS:

222.1+, for distinct joints to a third member for at least two layers of plural layer pipe (e.g., sheathed).

298+, for adjustable length couplings, especially subclass 302 for a telescopic joint.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

90, for test plugs; and subclasses 111+ for plural duct pipe structure.

166, Wells, 75.15, for well heads with fluid handling or other features special to wells, especially subclasses 86.1+, for a well head with an inner member sealed or anchored with respect thereto in combination with a valve and subclasses 88.1+for a well head with an inner member sealed or anchored with respect thereto in combination with a lateral port in the head, subclasses 179+ for packers situated below ground for sealing between a pre-positioned well conduit and an inserted pipe, and subclasses 206+ for expanding anchor means situated below ground between a pre-positioned well conduit and an inserted pipe.

251, Valves and Valve Actuation,

1.1+, for valve type blowout preventers.