US PATENT SUBCLASS 52 / 2.21
.~ Upstanding column (e.g., mast, tower)

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

2.11  DF  SHAPED OR STRENGTHENED BY FLUID PRESSURE {11}
2.21.~ Upstanding column (e.g., mast, tower)

DEFINITION

Classification: 52/2.21

Upstanding column (e.g., mast, tower):

(under subclass 2.11) Structure wherein the building structure or component comprises a tubular member, anchored at one end, which is extended by the fluid into a generally vertical position.

(1) Note. A structure of this subclass may be "self-erecting".

(2) Note. A structure of this subclass may consist of a plurality of members connected end-to-end.