Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Outside corner or peripherally bordered
Patent
1976-06-16
1977-05-10
Murtagh, John E.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Outside corner or peripherally bordered
403274, E06B 304
Patent
active
040219887
ABSTRACT:
A metal door frame is fabricated in the field by interfitting channel cross pieces in channel uprights and curling prepunched tongues in the uprights through openings in the cross pieces to square-up and to secure the cross pieces to the uprights.
REFERENCES:
patent: 1220163 (1917-03-01), Anderson
patent: 2632928 (1953-03-01), Kaufman
Edeus James A.
Johnston James R.
Murtagh John E.
National Manufacturing Company
Patnaude Edmond T.
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