Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1979-02-22
1981-07-21
Gron, Teddy S.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73358, 116216, 116217, 116219, 2522991, 252408, 350340, 350349, 350350R, 350350S, 350351, C09K 334, G02F 113, G01K 1106, G01K 1116
Patent
active
042791529
ABSTRACT:
A liquid crystal temperature indicator that gives a visual indication of whether the device is at a temperature above or below one or more threshold values has a homeotropically aligned nematic or smectic layer incorporating a pleochroic dye. The color of the cell changes as the dye will only absorb normally incident light when the temperature causes the liquid to go isotropic. Electrodes may be provided to provide electronic detection of the passage of the liquid through the threshold temperature.
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Constant, J., et al., "Photostable Antraquinone Pleochroic Dyes", presented at 7th Intern'l L. C. Conf., Bordeaux, Fr. (Jul. 1978).
Tani, C., et al., Appl. Phys. Lett., vol. 33, No. 4, pp. 275-277 (Aug. 1978).
Hareng, M., et al., Appl. Phys. Lett., vol. 25, No. 12, pp. 683-686 (Dec. 1974).
Taylor, G. N., et al.; J. Appl. Phys., vol. 45, No. 10, pp. 4330-4338 (1974).
Gron Teddy S.
International Standard Electric Corporation
O'Halloran John T.
Twomey Thomas N.
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