US PATENT SUBCLASS 405 / 150.1
.~ Lining

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

132  DF  UNDERGROUND PASSAGEWAY, E.G., TUNNEL {6}
150.1.~ Lining {2}
150.2  DF  .~.~> By spraying of settable material (e.g., concrete)
151  DF  .~.~> Panel {2}

DEFINITION

Classification: 405/150.1

Lining:

(under subclass 132) Method or apparatus relating to constructing the finished cross section of a tunnel by forming a shell or cast in place wall structure inside a bored hole.

(1) Note. Patents placed as originals in this and indented subclasses must claim either a method or apparatus for

constructing the shell or wall structure or the specific wall structure, per se.