Patent ID: 8596863

Claim:
A temperature indicator for a cooking vessel having an internal cavity for receiving a material to be open-flame heated and an outer side surface, comprising: a thermal insulator having a cylindrical sidewall extending between an open top and an open bottom and including a temperature indicating window to be disposed in close proximity to the vessel outer side surface, the open bottom of the thermal insulator adapted to expose a closed bottom of the cooking vessel such that the closed bottom extends axially beyond a lower-most edge of the sidewall of the thermal insulator, and comprising: a non-opaque substrate; a layer of thermochromic ink disposed on an inner side of said substrate and adapted to change from a dark color to a clear color when exposed to a predetermined temperature as caused from the transfer of heat from the vessel outer side surface; and a layer of material disposed on the inner side of said thermochromic ink layer and including indicia that is visible from an outer side of said substrate when said layer of thermochromic ink changes to a transparent color.