Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1989-11-16
1991-05-28
Apley, Richard J.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
434309, B43L 100
Patent
active
050189794
ABSTRACT:
An apparatus and method for providing a magnetic display in which a magnetic field produces visual patterns upon exposure to the apparatus. The apparatus comprises an enclosure which contains magnetically active flakes held within a dispersion medium which holds the magnetically active flakes in suspension, yet allows alignment of the flakes along the flux lines of the magnetic field when the flakes are exposed to the locus of the magnetic field.
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Paradise Creations, Inc. (1987): Erase-A-Slate, front box view.
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Gilano Michael
Gilano Michael A.
Langford Gordon B.
Apley Richard J.
Richman Glenn E.
The Ohio Art Company
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