Patent ID: 6326945
Filing Date: 2001-12-04
Classification: G06F,G09G

Abstract:
A magnetic writing board apparatus comprising:a non-magnetic grid matrix defining a plurality of grid cells;a display screen positioned over said non-magnetic grid matrix;a plurality of magnet assemblies, one each of said plurality of magnetic assemblies being slidably received within one each of said plurality of grid cells, each of said plurality of magnet assemblies being oriented in a common polarity, each of said plurality of magnet assemblies defining a display surface disposed to be visible through said display screen when said magnet assembly is moved to a forward position proximate said display screen;a masking agent disposed within each of said grid cells for masking said display surface of each of said plurality of magnet assemblies, said masking agent defining a color contrasting a color defined by said display face of each of said plurality of magnet assemblies, said masking agent being displaced when one of said plurality of magnet assemblies is moved toward said display screen, thus effecting a color change visible through said display screen;a writing implement emitting a magnetic field of a polarity opposite said common polarity of said plurality of magnet assemblies such that as said writing implement is passed over said display screen, proximate of said plurality of magnet assemblies are attracted toward said display screen and said display surface of each of said proximate magnet assemblies is made visible; andan erasing implement emitting a magnetic field of a polarity common to said common polarity of said plurality of magnet assemblies such that as said erasing implement is passed over said display screen, proximate of said plurality of magnet assemblies are repelled away from said display screen and said display surface of each of said proximate magnet assemblies is made invisible.