Color-change indicator

Details Color-change indicator Color-change indicator

1985-03-14

1986-12-16

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

368327, 116216, 374102, G04F 100, G01K 102

Patent

active

046293302

ABSTRACT:
A color change indicator including: a liquid having a predetermined index of refraction and rate of evaporation; a reservoir for holding the liquid; and an opacifying layer of microporous material. The opacifying layer has an index of refraction approximately the same as that of the liquid and overlies the reservoir. The opacifying layer has an open-cell network of pores for absorbing the liquid from the reservoir and is in a first radiation scattering condition when the liquid occupies the opacifying layer and in a second scattering condition when the liquid is depleted from the opacifying layer.

REFERENCES:
patent: 3480402 (1969-11-01), Jackson
patent: 3962920 (1976-06-01), Manske
patent: 4022149 (1977-05-01), Berger
patent: 4195058 (1980-03-01), Patel
patent: 4280441 (1981-07-01), McNeely
patent: 4382700 (1983-05-01), Youngren
patent: 4404922 (1983-09-01), Morane et al.
patent: 4408557 (1983-10-01), Bradley et al.

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