Toy that stably exhibits different colors with indicator for pro

Details Toy that stably exhibits different colors with indicator for pro Toy that stably exhibits different colors with indicator for pro

1990-10-12

1992-02-04

Yu, Mickey

Amusement devices: toys

Operated by intrinsic temperature change

446385, 428913, 106 21, A63H 3300

Patent

active

050856073

ABSTRACT:
An toy set having at least one section which bears a color memory dye of an electron-supplying organic coloring compound, an electron accepting compound and an ester. The color memory dye assumes a first color below t1 (.degree.C.) and a second color above t2 (.degree.C.), wherein t2>t1, 0.ltoreq.t1, t2.ltoreq.50.degree. C. and 5.ltoreq.t2-t1.ltoreq.35. Both the first and second colors can be displayed between t1 and t2. For the purpose of determining the proper temperature range for a color characteristic, temperature-sensitive visual indicators are provided.

REFERENCES:
patent: 1592148 (1926-07-01), Munn
patent: 4028118 (1977-06-01), Nakasuji et al.
patent: 4176273 (1979-11-01), Fujie
patent: 4554565 (1985-11-01), Kito et al.
patent: 4720301 (1988-01-01), Kito et al.
patent: 4725462 (1988-02-01), Kimura
patent: 4818215 (1989-04-01), Taga
patent: 4820683 (1989-04-01), Vervacke et al.
patent: 4895827 (1990-01-01), Vervacke et al.
patent: 4917643 (1990-04-01), Hippely
patent: 4920991 (1990-05-01), Shibahashi et al.

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