Temperature indicating compositions and devices

Measuring and testing – Gas analysis – Moisture content or vapor pressure

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Details

23230LC, 252299, 252408, 428 1, 116114Y, 106 19, 106 20, C09K 334, G01K 1116, C09D 1110

Patent

active

040709124

ABSTRACT:
Polymeric mixtures of a cholesterol material and a monomer are disclosed which can advantageously be utilized for the construction of temperature indicating devices. Each polymeric composition exhibits a color at temperatures below a fixed threshold temperature and then appears colorless at the threshold temperature. This characteristic permits safe, compact, accurate, fast responsive, disposable temperature indicating and warning devices to be made.

REFERENCES:
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patent: 3617374 (1971-11-01), Hodson et al.
patent: 3619254 (1971-11-01), Davis
patent: 3620889 (1971-11-01), Baltzer
patent: 3633425 (1972-01-01), Sanford
patent: 3661142 (1972-05-01), Flam
patent: 3826141 (1974-07-01), Pickett et al.
patent: 3871232 (1975-03-01), Pickett et al.
patent: 3885982 (1975-05-01), Fergason
patent: 3898354 (1975-08-01), Parker
patent: 3929021 (1975-12-01), Pecorella
patent: 3969264 (1976-07-01), Davis
patent: 3974317 (1976-08-01), Sharple ss

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