Element and method for teaching with liquid crystals

Details Element and method for teaching with liquid crystals Element and method for teaching with liquid crystals

1976-02-17

1977-08-02

Grieb, William H.

G09B 306

Patent

active

040387615

ABSTRACT:
An element for use as a teaching, examination and instructional material formed of a sheet having a visible image imprinted thereon and coded images keyed to the visible image in which the coded images are formed with a material, such as liquid crystals, which changes in appearance in response to temperature and in which the material in one of the images has a different temperature response than the material in the others of the images whereby the sheet is capable of multiple use as a teaching, examination and instructional element.

REFERENCES:
patent: 3359651 (1967-12-01), Mair
patent: 3451143 (1969-06-01), Thomas et al.
patent: 3508344 (1970-04-01), Thomas
patent: 3617324 (1971-11-01), Thomas
patent: 3632364 (1972-01-01), Thomas et al.
patent: 3647279 (1972-03-01), Sharpless et al.
patent: 3816113 (1974-06-01), Haas et al.
patent: 3880767 (1975-04-01), Chang et al.
patent: 3888892 (1975-06-01), Leder

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