Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1994-01-14
1995-05-02
Nakarani, D. S.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
273239, 4283215, 428323, 428328, 428329, 4284022, 42840221, 446131, B43L 100
Patent
active
054113989
ABSTRACT:
A magnetic display system uses a display wherein a non-magnetic substrate has applied thereon a microcapsule coating layer having sealed light-absorptive magnetic particles and light-reflective non-magnetic particles which are dispersed in an oily liquid. A permanent magnet causes a shift of the light-absorptive magnetic particles in one direction and, as a result, causing a shift of the light-reflective non-magnetic particles in the other direction. In the microcapsule coating layer, microcapsules having a plurality of diameters within a range from 100 microns to 1,000 microns are combined together. Furthermore, the light-absorptive magnetic particles sealed in the microcapsules have a plurality of particle diameters ranging from 0.2 microns to several icons. A suitable amount of magnetic particles capable of becoming a permanent magnet when magnetized after the microcapsule coating layer is coated is added. The mean particle diameter of the light-reflective non-magnetic particles sealed in the microcapsules ranges from 0.01 microns to several microns. A suitable amount of the microcapsules having a particle diameter far more minute than the mean particle diameter of the microcapsules and having sealed therein only the transparent oily liquid is added to the microcapsule coating layer.
REFERENCES:
patent: 3938263 (1976-02-01), Tate
patent: 4232084 (1980-11-01), Tate
patent: 4536428 (1985-08-01), Murata et al.
patent: 4643684 (1987-02-01), Murata et al.
patent: 5057363 (1991-10-01), Nakanishi
Kanno Yasuyuki
Nakanishi Masayuki
Japan Capsular Products Inc.
Nakarani D. S.
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