Magnetic display panels
OwnerWallace A. Krapfinventor
Life of this patent
Estimating the term…
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.
Claims7
A laminated magnetic display panel having an overall thickness of less than approxilately 0.1", and weighing less than approximately one pound per square foot, and comprising
- a core panel having opposed, plane, firm surfaces that are extremely resistant to indentation by marking pencils and the like,
- a pair of thin outer panels laminated, respectively, to the opposed surfaces of said core panel, and operatively increasing the rigidity and strength of said core panel, and
- a transparent plastic cover layer secured over at least one of said outer panels,
- at least said one outer panel comprising a layer of steel foil having a thickness in the approximate range of 2 to 5 mils, and operable releasably to retain magnetically-backed symbols against the outer surface of said plastic cover layer.
Dependencies are inferred from the claim text.