US PATENT SUBCLASS 52 / 81.5
.~.~.~ Trapezoidal or rectangular design

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

80.1  DF  COMPOUND CURVE STRUCTURE {3}
81.1  DF  .~ Geodesic shape {2}
81.4  DF  .~.~ Comprised entirely of a single self-supporting basic geometrical shaped panel {1}
81.5.~.~.~ Trapezoidal or rectangular design

DEFINITION

Classification: 52/81.5

Trapezoidal or rectangular design:

(under subclass 81.4) Panel in which the configuration is a quadrilateral having (1) two parallel sides and two diverging (or converging) sides or (2) all corners at right angles.