Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1980-12-05
1982-10-19
Gron, Teddy S.
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
116216, 2522997, 252316, 428 1, C09K 334, G01K 1116, G01K 1118
Patent
active
043543855
ABSTRACT:
For the measurement and the indication of low temperatures, particularly between 0.degree. C. and -30.degree. C., there is foreseen a thermometric composition of cholesteric substances comprising, besides cholesteryl nonanoate, cholesteryl oleyl carbonate and cholesteryl chloride, cholesteryl acetate in an amount increasing with the increase from 0.degree. C. to -30.degree. C. of the temperature to be measured and indicated.
There are also contemplated thermometric indicating devices, particularly suitable for the measuring and indicating of the temperature of freezing cells.
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patent: 3529156 (1970-09-01), Fergason et al.
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patent: 4301054 (1981-11-01), Buirley et al.
Alfassi, Z. B., et al., Mol. Cryst. Liq. Cryst., vol. 56, (Letters), pp. 127-131, (1979).
Gray, G. W., et al., Liquid Crystals and Plastic Crystals, vol. 1, John Wiley & Sons, Inc., New York, pp. 327-337, (1974).
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