Tempeature measurement and display of indicia using thermochromi

Details Tempeature measurement and display of indicia using thermochromi Tempeature measurement and display of indicia using thermochromi

1979-04-30

1982-07-20

Barr, J. L.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

20415922, 252408, 116202, 116207, 526285, C01K 1112

Patent

active

043399517

ABSTRACT:
Certain polyacetylenes exhibit reversible color changes at transition temperatures in the range -180.degree. to 220.degree. C., wherein the thermochromic cycles can be repeated many times with no apparent degradation and little change in spectroscopic properties.
These thermochromic polyacetylenes are useful in temperature-indicator and indicia-display device applications.
A process for laser-beam recording of images is described employing a thermochromic polyacetylene, in which the hysteresis properties of the polyacetylene can be suitably altered allowing for selectively storing or erasing the formed image.

REFERENCES:
patent: 3501297 (1970-03-01), Cremeans
patent: 3723121 (1973-03-01), Hauser
patent: 3822134 (1974-07-01), Rasch et al.
patent: 3999946 (1976-12-01), Patel et al.

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