Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1981-10-05
1984-08-28
Gron, Teddy S.
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
25229901, 2522997, 2522996, 25229966, 374161, 374162, C09K 334, G01K 1112
Patent
active
044681372
ABSTRACT:
A temperature indicating device comprising a series of liquid crystal cells each of which contains a liquid crystal material having a different composition, the composition varying from cell-to-cell, and each of which cells exhibits the grandjean state whereby temperature is indicated by iridescence of the cells, the cells being such that the liquid crystal material in each has a clearing point at a different selected temperature in a series of temperature in a temperature range of interest and that each of the cells is such that its liquid crystal material does not revert immediately to the grandjean state on cooling from the isotropic liquid state wherein the improvement comprises the cells having a construction such that the liquid crystal material of each cell undergoes, on cooling from the isotropic liquid state, the transition isotropic liquid state to focal conic state, without reverting immediately to the grandjean state.
REFERENCES:
patent: 3947375 (1976-03-01), Gray et al.
patent: 4077260 (1978-03-01), Gray et al.
patent: 4139273 (1979-02-01), Crossland
patent: 4154697 (1979-05-01), Eidenschink et al.
patent: 4227778 (1980-10-01), Raynes
patent: 4257911 (1981-03-01), Gray et al.
patent: 4296631 (1981-10-01), Fergason
patent: 4385844 (1983-05-01), Fergason
Gray & McDonnell, Synthesis & Liquid Crystal Properties . . . , Mol. Cryst. Liq. Cryst., 1976, vol. 37, pp. 189-211.
Hilsum Cyril
McDonnell Damien G.
Gron Teddy S.
Kilby Catherine S.
National Research Development Corporation
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