Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Truss with unitary chord and web; e.g. – sheet metal
Reexamination Certificate
2007-08-21
2007-08-21
Canfield, Robert (Department: 3635)
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Truss with unitary chord and web; e.g., sheet metal
C052S650100, C052S749100, C052S749100, C029S897310, C029S897350, C138S168000, C138S173000
Reexamination Certificate
active
09799330
ABSTRACT:
The present invention relates to a light weight building material (1) for structural work. The light weight building material (1) comprises at least three walls, a first wall (11), a second wall (12) and a third wall (13) formed from a single piece of galvanized iron sheet to form a triangular-section. However, a circular section may also be used while a rectangular section is preferred. The galvanized iron sheet is cut and cold-rolled to form the light weight building material (1).
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Canfield Robert
Hamre Schumann Mueller & Larson P.C.
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