US PATENT SUBCLASS 52 / 223.3
.~ Tubular shaped tank, silo, cooling tower, etc.

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}
223.3.~ Tubular shaped tank, silo, cooling tower, etc.

DEFINITION

Classification: 52/223.3

Tubular shaped tank, silo, cooling tower, etc.:

(under subclass 223.1) Preloaded structure which is vertically extending, has a generally circular cross-section, and strengthened to reduce the effect of radial forces.