US PATENT SUBCLASS 52 / 309.8
.~.~ Adjacent nonporous layer

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

309.1  DF  WITH SYNTHETIC RESINOUS COMPONENT {4}
309.4  DF  .~ Foam {4}
309.8.~.~ Adjacent nonporous layer {2}
309.9  DF  .~.~.~> Nonporous exterior faces {1}
309.12  DF  .~.~.~> Cementitious material

DEFINITION

Classification: 52/309.8

(under subclass 309.4) Structure wherein the porous, foam-like component is directly adjacent to at least one nonfoam-like component.