Stock material or miscellaneous articles – Sheets or webs edge spliced or joined – Sheets or webs coplanar
Patent
1984-06-20
1986-04-22
Lesmes, George F.
Stock material or miscellaneous articles
Sheets or webs edge spliced or joined
Sheets or webs coplanar
428192, 428201, 428215, 4283044, 4283171, 4283184, 428455, 428464, 428900, 434430, G09B 2900
Patent
active
045842230
ABSTRACT:
The panel has a light, generally rigid cardboard or foamed cork core to opposite sides of which are laminated two, thin sheets of steel foil ranging from 2 to 5 mils in thickness. Paper sheets are secured to and cover the outer surfaces of the steel foil; and these sheets have transparent plastic covers secured thereover. The panel has an overall thickness of less than 0.1" and weighs less than one pound per square foot--e.g. approximately 7 oz./sq. ft. The edges of the panel are covered by strips of molding to prevent injury from the sharp edges of the steel foil and to prevent damage to the panel. Magnetically-backed symbols are releasably attachable to the plastic cover layers, which also are adapted to have erasable graphics marked thereon by liquid crayon or the like.
REFERENCES:
patent: 3093919 (1963-06-01), Holtz
patent: 3298124 (1967-01-01), Jahn
patent: 3456373 (1969-07-01), Epton
patent: 3549463 (1970-12-01), Frech
patent: 3619313 (1971-11-01), Sznch
patent: 3654711 (1972-04-01), Taylor
patent: 3716935 (1973-02-01), Friederichs
patent: 3726026 (1973-04-01), Borcherding
patent: 3751839 (1973-08-01), Mitchell
patent: 3839130 (1974-10-01), Dean et al.
patent: 4507888 (1985-04-01), Robinson et al.
Atkinson William M.
Lesmes George F.
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