Heating unit with thermochromic region

Details Heating unit with thermochromic region Heating unit with thermochromic region

1988-04-11

1991-01-08

Reynolds, Bruce A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

338214, 219544, 219530, H05B 368

Patent

active

049838105

ABSTRACT:
A heating unit includes a heatable surface. At least a region of the heatable surface is coated or otherwise provided with a layer incorporating a thermochromic material in sufficient quantity to influence the perceived color of the layer. The thermochromic material exhibits an absorption edge wavelength which changes reversibly with temperature in the range of from 20.degree. C. to at least 400.degree. C. The absorption edge wavelength is at least 540 nm at 20.degree. C. and progressively increases to at most 700 nm at 400.degree. C. Such a heating unit is able to provide a visual indication of whether or not the heatable surface is still hot once the power has been switched off. Useful thermochromic materials include Cd(S.sub.1-x Se.sub.x) and (Zn.sub.1-y Mn.sub.y)O.

REFERENCES:
patent: 3352794 (1967-11-01), Abdo
patent: 3781522 (1973-12-01), Borom et al.
patent: 3781523 (1973-12-01), Borom
"Thermochromism of Inorganic Compounds", by J. H. Day, Chem. Rev. vol. 68, No. 6, Nov. 25, 1968, pp. 669-657.

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