US PATENT SUBCLASS 175 / 249
.~ Core-retaining or severing means

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

244  DF  WITH MEANS MOVABLE RELATIVE TO TOOL TO RECEIVE, RETAIN, OR SEVER UNDISTURBED CORE {3}
249.~ Core-retaining or severing means {5}
250  DF  .~.~> Fluid-actuated
251  DF  .~.~> Actuated upon relative movement between tool and tool shaft {1}
253  DF  .~.~> With element holding retaining or severing means inactive
254  DF  .~.~> Mounted on transverse pivot
255  DF  .~.~> Sliding wedge type (e.g., slips)

DEFINITION

Classification: 175/249

(under subclass 244) Apparatus in which the movable means comprises a means to grasp or make a cut in the core after it has been formed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3, for processes or devices for severing a core by means of an explosive or explosion.

240, for undisturbed core receiver combined with movable flow stopping means adapted to underlie a severed core.

263+, for cutter element laterally shiftable below ground.

333, for rolling cutter bits with fixed core breaking means.

404, for core forming type bits with fixed core breaking means. SEE OR SEARCH CLASS

166, Wells,

55+, for earth embedded well pipe cutters.

294, Handling: Hand and Hoist-Line Implements,

86.1+, for grappling means having structural features adapted to function in a bore hole or similar earth opening.