Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1992-05-07
1994-03-22
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
052958370
ABSTRACT:
An apparatus for providing a magnetic visual display in which a magnetic field is exposed to a dispersion medium sealed between two surfaces and having distributed therein randomly-oriented magnetically-active flakes, thereby causing alignment of a portion of the flakes and allowing transmission of light through the dispersion medium in the region of the aligned flakes to form an image by the contrast between the areas of aligned and randomly-oriented flakes. The contrast may be enhanced by a light source on the opposite side of the device from the viewer. The image may be colored by coloring either of the surfaces, the dispersion medium, the flakes or the light from the light source.
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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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