US PATENT SUBCLASS 52 / 589.1
.~ Having integral key

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

578  DF  MODULE OR PANEL HAVING DISCRETE EDGEWISE OR FACE-TO-FACE CONNECTING FEATURE {6}
589.1.~ Having integral key {3}
590.1  DF  .~.~> Dovetail-type key {2}
591.1  DF  .~.~> Key on angularly related edges or faces {3}
592.1  DF  .~.~> Keys, mortises, or key and mortise on opposed edges or faces {3}

DEFINITION

Classification: 52/589.1

Having integral key:

(under subclass 578) Discrete connecting feature in which the modular panel, block, or tile unit has two portions with at least one projection or at least one recess that are a constituent part of the entire panel, block, or tile.

SEE OR SEARCH THIS CLASS, SUBCLASS:

271, for a construction with spaced intersections with a key joint between a superimposed unit.

286, for a corner block-type module with horizontal and vertical keys.

436, for a cast-in-situ section bonding interengaging section of modules.

448, for a plaster-type imperforate area backer having interengaging edge joints.

474+, for a module fixed to an elongated sustainer which may conform in shape to the sustainer.

519+, for an interfitted, lapped, multiplanar section forming a surfacing; e.g., shingle-type. 561+, particularly subclasses 567 and 570 for laterally related module courses which may include mating deformations on the modules.