Novel compositions, devices and method

Details Novel compositions, devices and method Novel compositions, devices and method

1980-09-22

1983-05-31

Gron, Teddy S.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

116216, 25229967, 2522997, 25229901, 428 1, 374161, 374162, C09K 334, G01K 1116, G01K 1118, G01K 300

Patent

active

043858449

ABSTRACT:
Disclosure is made of novel temperature sensing devices such as temperature indicating and recording devices. The devices of the invention differ from prior art devices in that they employ new and improved temperature indicating compositions. The temperature indicating compositions of the invention comprise an optically active, non-cholesteric inert compound in admixture with nematic type liquid crystal compounds. The optically active, inert compounds lend a visible point of reference to the compositions when the liquid crystals pass through their liquid transition points. The proportion of optically active, inert compounds added to the nematic liquid crystals is that proportion which will impart chirality or twist to the compositions of the invention and is dependent upon the twisting power of the optically active ingredient. The compositions of the invention are unique in that they possess very sharp liquid transition points, i.e.; clearing points over a very narrow temperature range. This is an ideal characteristic for compositions to be employed as accurate sensors of specific temperatures.

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