US PATENT SUBCLASS 52 / 650.1
.~.~ Beam (e.g., girder, joist, etc.)

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

633  DF  OPENWORK; E.G., TRUSS, TRELLIS, GRILLE, SCREEN, FRAME, OR REBAR CHAIR {12}
648.1  DF  .~ Three-dimensional space-defining {9}
650.1.~.~ Beam (e.g., girder, joist, etc.) {1}
650.2  DF  .~.~.~> Inclined struts or ties meeting at intermediate runner

DEFINITION

Classification: 52/650.1

Beam (e.g., girder, joist, etc.):

(under subclass 648.1) Subject matter the structure of which defines a horizontal, elongate, load supporting unit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

649.2+, for concrete girder, etc., having rebar in a three-dimensional grid.