Resources Contact Us Home
Electric heating element

Image Number 2 for United States Patent #4233497.

An electric heating element for a cooking apparatus or other device requiring uniform heat generation over an extended area is presented in which the thickness (T) of the electrically resistive heating element increases from the outer edges of the generally disc-shaped element towards the center in inverse proportion to the square of the ratio of the radius (r) at any point to that of the radius at a reference point ("a"), so that ##EQU1## Heating elements fabricated with cross sectional shapes calculated in accordance with the parameters set forth above and disclosed in detail herein and in which the current flow is radial, provide uniform energy release and therefore nearly uniform heat across the surface of the element. Additionally, the absolute element dimensions and masses per unit surface area are small, maximizing rates of desired temperature setting changes. The basic principle is applicable in several technologies related to cooking, e.g., vacuum evaporation.

  Recently Added Patents
Control device with adjusting pulse width modulation function and the backlight module thereof
Multi-contoured yoga support
Managing job execution
Computerized information and display methods
LED-array package
Compositions of quaternary ammonium compounds containing bioavailability enhancers
System, method and computer program product for efficient caching of hierarchical items
  Randomly Featured Patents
Dilution air dispensing apparatus
Handling devices
Systems and methods for redistributing data in a relational database
Communication card set
Modular shelter
System and method for transforming business process policy data
Nonvolatile semiconductor memory and method of operating the same
Paper sheet material dispenser apparatus
Frame for a device mounted above a printed circuit board in an electronic device
Double-diameter knot pusher