US PATENT SUBCLASS 29 / 897.31
.~.~.~ Openwork, e.g., a truss, joist, frame, lattice-type or box beam

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
897  DF  .~ Structural member making {4}
897.3  DF  .~.~ Static structure, e.g., a building component {5}
897.31.~.~.~ Openwork, e.g., a truss, joist, frame, lattice-type or box beam {1}
897.312  DF  .~.~.~.~> Frame component

DEFINITION

Classification: 29/897.31

Openwork, e.g., a truss, joist, frame, lattice-type or box beam:

(under subclass 897.3) Process for manufacturing a structural element area having passages or openings wherein the openings are formed by plural members held at spaced intervals or by perforating sheet-like members.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings),

633+, for openwork structures including truss, screen, frame, etc.