US PATENT SUBCLASS 52 / 223.4
.~ Axially loaded vertical structure (e.g., column, derrick)

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

223.1  DF  WITH COMPONENT HAVING DISCRETE PRESTRESSING MEANS {7}
223.4.~ Axially loaded vertical structure (e.g., column, derrick) {1}
223.5  DF  .~.~> Composed of stacked sections

DEFINITION

Classification: 52/223.4

Axially loaded vertical structure (e.g., column, derrick):

(under subclass 223.1) Preloaded upright structure which is strengthened along an axis perpendicular to or at a high angle to the earth's surface.