US PATENT SUBCLASS 52 / 592.4
.~.~.~ Having mortise with internal space

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  DF  .~.~ Keys, mortises, or key and mortise on opposed edges or faces {3}
592.4.~.~.~ Having mortise with internal space {1}
592.5  DF  .~.~.~.~> And provided for stacking

DEFINITION

Classification: 52/592.4

Having mortise with internal space:

(under subclass 592.1) Integral key on opposed edges wherein the indentation is designed to accommodate both the projection and, e.g., an internal settable material such as grout.