Magnetic display panel using reversal magnetism

Details Magnetic display panel using reversal magnetism Magnetic display panel using reversal magnetism

1980-12-10

1983-01-18

Sikes, William L.

G02F 101

Patent

active

043689523

ABSTRACT:
A magnetic reversal type display panel which provides clear display of records which can easily be raised by an erasure magnet. A liquid dispersion is sealed between two opposed surface plates, preferably in a cell structure. The liquid dispersion contains fine reversible magnetic display grains having magnetic poles of opposite signs tinged with different colors, a dispersion medium and a fine grain thickener. The fine reversible magnetic display grains have a residual magnetic moment within the range of 0.2 to 10 emu/g and a coercive force of not less than 500 oersteds and the liquid dispersion has a yield value of not less than 5 dynes/cm.sup.2.

REFERENCES:
patent: 3670323 (1972-06-01), Sobel et al.
patent: 4126854 (1978-11-01), Sheridon

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