Method of making a rotary ball display device

Details Method of making a rotary ball display device Method of making a rotary ball display device

1983-01-17

1984-03-20

Lusignan, Michael R.

Coating processes

Particles, flakes, or granules coated or encapsulated

Applying superposed diverse coatings or coating a coated base

427282, 427336, 427352, 34081508, 340783, G09G 300, B05D 700

Patent

active

044381603

ABSTRACT:
A method for manufacturing rotary ball display devices wherein a plurality of such balls are provided with a coating of a color different from the remainder of the ball, the ball members are coated with a thin coating insoluble in the settling medium into which they are introduced, so that upon settling into a low viscosity liquid, they form a uniform layer. A high molecular weight hardenable coating material which is soluble in the low viscosity liquid is then poured onto the coated ball members to cover the layer. Then, the low viscosity liquid is removed and the hardenable coating material is caused to harden. The thin coating is then dissolved away from portions of the ball members to leave cavity portions thereabout into which a high resistivity liquid is introduced. The resulting ball members have a refractive index on the colored layer which is substantially the same as the refractive index of the high resistivity liquid contained in the cavities.

REFERENCES:
patent: 3924226 (1975-12-01), Lacy et al.
patent: 4126854 (1978-11-01), Sheridon

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