Heat activated amusement device employing microencapsulated ther

Details Heat activated amusement device employing microencapsulated ther Heat activated amusement device employing microencapsulated ther

1992-04-03

1993-06-29

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 50, 359 82, 359101, 273146, 446 14, G02F 113, A63H 3300

Patent

active

052239586

ABSTRACT:
A heat activated amusement device is stimulated, by the transfer of thermal energy from a person's body or a heated object, to reveal by color differentiation a hidden message or visual image.

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