US PATENT SUBCLASS 405 / 177
.~.~ With positive feed or means to vary tension in pipe or cable

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

154  DF  PIPE OR CABLE LAYING, RETRIEVING, OR UNDERWATER MANIPULATION {6}
174  DF  .~ By means advancing along terrain and guiding pipe or cable into subterranean position {6}
177.~.~ With positive feed or means to vary tension in pipe or cable

DEFINITION

Classification: 405/177

With positive feed or means to vary tension in pipe or cable:

(under subclass 174) Method or apparatus wherein either (a) the string or conduit is in the form of an elongated flexible

member and means are provided whereby a force transmitted along the member tending to pull the entrenched or buried portion from below the surface can be lessened or neutralized, or (b) a motive force is provided to feed the string or conduit from a supply toward its final position below the surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

165, for apparatus or methods for entrenching pipe or cable in the bottom earth surface of a body of water, combined with feeding or tensioning means.

168.1+, for submarine pipe laying apparatus having means to control tension and other stresses in the pipe as it is transferred from the surface to the bottom.