US PATENT SUBCLASS 175 / 250-- .~.~ Fluid-actuated

US PATENT SUBCLASS 175 / 250
.~.~ Fluid-actuated

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	DF	.~ Core-retaining or severing means {5}
250		.~.~ Fluid-actuated

DEFINITION

Classification: 175/250

(under subclass 249) Apparatus in which the core retaining or severing means is moved from one position to another by fluid pressure or flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

99, and the subclasses there noted for other pressure fluid operated devices.

247, for fluid pressure responsive means to remove a core receiver or operate a means latching a core receiver in a tool shaft.

267+, for cutter element shifted relative to bit head below ground by fluid pressure.

SEE OR SEARCH CLASS 294, Handling: Hand and Hoist-Line Implements,

86.15, for well grapples shiftable to engage an object or earth core through a fluid pressure means.