US 6,639,190 B2Granted

Heat alert safety device for smoothtop stoves and other hot surfaces

OwnerWilliam S. Lernerinventor

Life of this patent

Estimating the term…

Loading patent…

Abstract

Liquid crystals compositions designed to turn red or orange and remain red or orange at or above a specified temperature, such as 115 degrees Fahrenheit, are shaped in the outline of the word “HOT” and 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 or orange and instantly alert anyone that the heat element of the stove or the window is too hot to touch. For use on smooth cooktop stoves, including warming trays, the liquid crystal display is embedded in a top surface of the smooth area of glass or metal that forms the beating element of the stove. For wall ovens and toaster ovens, the liquid crystals are embedded in the vertical window surface. A versatile heat alert safety device is removably attachable to any hot surface whether flat or rounded.

Claims2

Dependent claims

A heat alert safety device attachable to hot surfaces including hot metal surfaces, hot glass surfaces and other hot surfaces, for warning individuals that the surface is hot, comprising:

a liquid crystal composition,
a container for housing the liquid crystal composition, said container being transparent at least in a portion of the container covering the liquid crystal composition and being made of heat conductive material,
the liquid crystal composition shaped to convey an outline of the letters “HOT”, embedded in a flat face of the container and designed to turn red and remain red whenever the temperature of the hot surface exceeds a specified temperature,
an attachment element made of a heat conductive material, said attachment element being attachable to the hot surface so as to allow the letters “HOT” to be visible and said attachment element being removable from the hot surface to attach the device to a different hot surface or a different part of the hot surface, the attachment element being able to withstand surface temperatures of at least 300 degrees Fahrenheit.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/788,594Filed 21 Feb 2001
Published: US 2002/0113057 A122 Aug 2002
Granted: 28 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

F24C 3/126
Arrangement or mounting of control or safety devices: on ranges
A47J 31/58
Parts or details or accessories of beverage-making apparatus: safety devices
F23N 5/082
Using light-sensitive elements: using electronic means
F23N 5/24
Systems for controlling combustion: preventing development of abnormal or undesired conditions, i.e. safety arrangements