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).
