THERMOGRAM OF A HEAT RETENTIVE PLATE
(Does not show maximum temperatures reached)
Taken with a special Infrared camera (by Ramiro Fierro)
The thermal gradient created by the design makes the rim stay cool for easy handling and keeps the plate from breaking due to thermal shock; the plate needs only one to 1:15 minutes preheating in a microwave oven to remain hot for 30 minutes (half hour), it is still hot not warm after 30 minutes, of course if you do not want it very hot you can preheat it for 30 seconds (for eggs over easy for instance) or as you prefer.
A new low cost, very efficient microwave absorbing material was developed (US patent pending 11/639,602) specially for this purpose.
For more information see:
For photos of the original development process (crude prototypes):
Marketability information etc.: