(under subclass 576) Structure including a thin-walled member or members defining a closed periphery, which member in use is embedded in a settable material and forms an unoccupied void within the material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
22, for a construction of vertically spaced roof sections.
220.1, for a service duct within a barrier.
302.1+, for a construction with a fluid passage communicating with an enlarged space, e.g., a hollow in a wall and see search notes.
320, for a cast barrier with ribs and blocks forming voids. 380+, for a cast in situ barrier defining an isolated space.
404.1+, for a nonsettable insulating material within a cavity.
503+, for a construction of wherein modules form a barrier with a through fluid passage.
553+, for a lapped multiplanar surfacing with spacing or space forming feature.
