| 摘要 |
Liquid crystals compositions, i.e. cholesteric liquid crystals or various types of liquid crystal polymers designed to turn red at or above a specified temperature and remain red at or above that temperature and that are shaped in the outline of the word "HOT" (or for cooktop stoves of a ring surrounding the heating element that may be interrupted by such an outline) are embedded on the top surface of the heating element of stoves or on the window surface of wall ovens and toaster ovens so that they glow red and instantly alert anyone that the heat element of the stove or the window is too hot to touch. For use on electric stoves including small mobile electric stoves called hot plates, the device is an improved electric coil whose central recessed area contains liquid crystals. For use on smooth cooktop stoves, including small mobile cooktop stoves called warming trays, the liquid crystal display is embedded in a top surface of the smooth area of glass or metal that forms the heating element of the stove. For gas stoves, the liquid crystals are embedded in a disk mounted on a top surface of the central metal element of each heating element of the gas stove. For wall ovens and toaster ovens, the liquid crystals are embedded in the vertical window surface. In each embodiment, the liquid crystals stay red as long as the temperature they sense exceeds a certain degree Fahrenheit, such as 115 degrees Fahrenheit.
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