US PATENT SUBCLASS 405 / 174
.~ By means advancing along terrain and guiding pipe or cable into subterranean position

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.~ By means advancing along terrain and guiding pipe or cable into subterranean position {6}
175  DF  .~.~> Condition responsive
176  DF  .~.~> Tape or strip
177  DF  .~.~> With positive feed or means to vary tension in pipe or cable
178  DF  .~.~> Simultaneous laying of plural parallel pipes or cables
179  DF  .~.~> With backfill or bedding material conveying or dispensing means
180  DF  .~.~> Including trench forming plow with pipe or cable guide {3}

DEFINITION

Classification: 405/174

By means advancing along terrain and guiding pipe or cable into subterranean position:

(under subclass 154) Method or apparatus wherein a means is

utilized which moves continuously substantially parallel to the axis of the placed string or conduit to guide or direct said string or conduit from a position above the earth surface to a final, substantially fixed position below the surface.

(1) Note. Included herein are method and apparatus wherein only a portion or portions of the length of the string or conduit is positioned below the surface.