Indicator system and means for irreversibly recording a temperat

Details Indicator system and means for irreversibly recording a temperat Indicator system and means for irreversibly recording a temperat

1982-04-14

1984-09-04

Gron, Teddy S.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

116206, 116207, 116216, 116217, 116219, 2522995, 2522997, 2524081, 252962, 374102, 374106, 374141, 374161, 374162, 436 2, C09K 334, G01N 2106, G01N 3122, G01K 300, G01K 1116

Patent

active

044694520

ABSTRACT:
System and means for irreversibly recording the incidence of a predetermined temperature comprising a cholesteric liquid crystal system and an activator material capable of interacting with the liquid crystal system to induce a unique irreversible change in the optical properties thereof sustantially at the predetermined temperature. The system preferably includes means for separating the liquid crystal system and activator at temperatures below the activation temperature of the activator.

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"Use of Liquid Crystals as Vapor Detectors", Mol. Cryst. Liq. Cryst., vol. 27, E. J. Posiomek, et al.

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