US PATENT SUBCLASS 175 / 340
.~.~.~ Fluid conduit lining or element (e.g., slush tube or nozzle)

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

327  DF  BIT OR BIT ELEMENT {21}
331  DF  .~ Rolling cutter bit or rolling cutter bit element {26}
339  DF  .~.~ With drilling fluid conduit details {1}
340.~.~.~ Fluid conduit lining or element (e.g., slush tube or nozzle)

DEFINITION

Classification: 175/340

(under subclass 339) Apparatus in which the means to supply drilling fluid comprises (1) a coated or treated passage or (2) a distinct element which is limited in use to conducting, directing, or blocking the drilling fluid.

(1) Note. A fluid conducting element under part (2) of the definition which is also a cutter element or a bit is classified either with subclass 339 or is classified on other bit structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

227+, for a storage and conduit means for lubricant other than drilling fluid for a bit.

332+, for a core forming type roller bit provided with a fluid conduit lining or element.

337, for a drilling fluid supply to a roller cutter element bearing.

393, for a fluid conduit lining or fluid conducting, directing or blocking element for a bit other than a roller type bit.