US PATENT SUBCLASS 52 / 592.1
.~.~ Keys, mortises, or key and mortise on opposed edges or faces

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  DF  .~ Having integral key {3}
592.1.~.~ Keys, mortises, or key and mortise on opposed edges or faces {3}
592.2  DF  .~.~.~> Key designed for four direction lock {1}
592.4  DF  .~.~.~> Having mortise with internal space {1}
592.6  DF  .~.~.~> Designed for stacking (e.g., key on top surface, mortise on bottom)

DEFINITION

Classification: 52/592.1

Keys, mortises, or key and mortise on opposed edges or faces:

(under subclass 589.1) Integral key wherein one unit has sides that are substantially parallel and said sides have: (1) at least two projections with at least one projection on each side; or (2) at least two indentations with at least one indentation on each side; or (3) at least one indentation on one side and a projection on the other side.