US PATENT SUBCLASS 285 / 306
.~ Line pressure-responsive


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

305  DF  ESSENTIAL CATCH {7}
306.~ Line pressure-responsive


DEFINITION

Classification: 285/306

(under subclass 305) Subject matter including catch means responsive to the line pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

83, for line pressure responsive auxiliary latch means.

102, and 104+, for similar means combined with a fluid pressure seal.

SEE OR SEARCH CLASS

166, Wells, 55.4+, for devices which perforate or split well tubing by explosive means, and subclass 212 for a fluid pressure actuated expansible anchor.

251, Valves and Valve Actuation,

94, for fluid pressure biased latches in valve actuator combinations.

294, Handling: Hand and Hoist-Line Implements,

86.24+, for expanding grapples adapted for use in a well bore, and subclasses 93+ for expanding grapples of general utility.