US PATENT SUBCLASS 405 / 286
.~.~.~ Concrete

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

258  DF  EARTH TREATMENT OR CONTROL {5}
272  DF  .~ Shoring, bracing, or cave-in prevention {6}
284  DF  .~.~ Retaining wall {2}
286.~.~.~ Concrete {1}
287  DF  .~.~.~.~> Cast in situ

DEFINITION

Classification: 405/286

Concrete:

(under subclass 284) Method or apparatus wherein the vertical barrier or a portion thereof is composed of concrete, plain or reinforced.