US PATENT SUBCLASS 52 / 721.4
.~.~.~.~ Having outer layer or shell

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}
721.2  DF  .~.~ Upright {3}
721.3  DF  .~.~.~ Sustainer {1}
721.4.~.~.~.~ Having outer layer or shell {1}
721.5  DF  .~.~.~.~.~> Partial sleeve or collar

DEFINITION

Classification: 52/721.4

Having outer layer or shell:

(under subclass 721.3) Structure having an outer covering of a material or structural feature differing from that of the enclosed portion of the shaft.

SEE OR SEARCH THIS CLASS, SUBCLASS:

269, for a wall enclosed usable space with a pre-formed dissimilar material lining or shell.

423, for a similar construction wherein a module is bonded together by an internal cast in situ section.

736.3+, 737.4+, and 738.1, for a shaft with a dissimilar material shell or facing without a stone-like component