Temperature indicating compositions and devices

Details Temperature indicating compositions and devices Temperature indicating compositions and devices

1975-10-01

1978-01-31

Padgett, Benjamin R.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

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:
patent: 3576761 (1971-04-01), Davis
patent: 3600060 (1971-08-01), Churchill et al.
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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