US PATENT SUBCLASS 52 / 724.4
.~.~.~ Having arch feature

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

720.1  DF  SHAFT (I.E., ELONGATED RIGID STRUCTURE) {15}
721.1  DF  .~ Stone-like component (e.g., concrete, etc.) {2}
724.1  DF  .~.~ Having feature resisting transverse loading (e.g., beam) {4}
724.4.~.~.~ Having arch feature

DEFINITION

Classification: 52/724.4

Having arch feature:

(under subclass 724.1) Structure wherein the longitudinal dimension of the shaft describes an arc or the shaft has arcuate features within it (e.g., scalloped, etc.).