Patent ID: 8740007

Claim:
A cooking utensil, comprising: a cooking body having an external bottom surface, wherein the cooking body does not have an electromagnetic property; a first metal-ceramic composite layer having an electromagnetic property disposed on the external bottom surface of the cooking body, wherein a metal portion of the first metal-ceramic composite layer comprises iron, cobalt, nickel, or an alloy thereof, a ceramic portion of the first metal-ceramic composite layer comprises iron oxide, cobalt oxide, nickel oxide, or a combination thereof, and the metal portion accounts for 50 wt % to 85 wt % of the first metal-ceramic composite layer; a second metal-ceramic composite layer having a heat conductive property disposed on the first metal-ceramic composite layer, wherein the second metal-ceramic composite layer contacts an external environment, and wherein a metal portion of the second metal-ceramic composite layer comprises aluminum or an alloy thereof, a ceramic portion of the second metal-ceramic composite layer comprises aluminum oxide, and the metal portion accounts for 20 wt % to 85 wt % of the second metal-ceramic composite layer; and a third metal-ceramic composite layer having an electromagnetic property disposed between the external bottom surface of the cooking body and the first metal-ceramic composite layer, wherein the third metal-ceramic composite layer and the first metal-ceramic composite layer are fabricated with different materials.