US PATENT SUBCLASS 251 / 1.1
BLOW-OUT PREVENTERS (I.E., COOPERATING SEGMENTS OF ANNULUS)


Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

1.1BLOW-OUT PREVENTERS (I.E., COOPERATING SEGMENTS OF ANNULUS) {2}
1.2  DF  .~> Deformable annulus
1.3  DF  .~> Radial reciprocating ram


DEFINITION

Classification: 251/1.1

BLOW-OUT PREVENTERS (I.E., COOPERATING SEGMENTS OF ANNULUS:

(under the class definition) Subject matter comprising a

plurality of relatively movable flow obstructing members which control an annular flow passage about an axial rod or pipe as between a well casing and drill stem and have characteristics which go beyond a mere sealing means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

146, for valves and/or couplings made in sections to facilitate mounting on continuous conduits.

SEE OR SEARCH CLASS

166, Wells,

75.11+, especially subclasses 86.1+ and 88.1 for well heads comprising blow-out preventers and additional means for handling fluid from the well or other specific well features, and subclasses 179+ and the subclasses there noted for packers or plugs inserted into a prepositioned well conduit.

222, Dispensing, 502+, for sectional valves in dispensers.

227, Elongated-Member-Driving Apparatus, appropriate subclasses, for a packing between a casing head and an inner pipe or rod particularly

4, for a pipe end attached packing assembly, subclasses 5+ for a packing between a casing head and a longitudinally moving coupled rod, and subclass 31 for a rotatable packing for an axially moving rod.

277, Seal for a Joint or Juncture, for a generic sealing means or process,

324+, for a seal for well apparatus having an overpressure control device that may include extrusion preventing (i.e., anti-extrusion) structure.

285, Pipe Joints or Couplings,

123.14, for joints between concentric stationary pipes (e.g., and packing type blow-out preventer between a well casing head and a tubing).