Patent ID: 7537129

Claim:
A disposable beverage container with a lid, the container comprising a closed end from which a side wall or side walls extend to an open end surrounded by a circular rim, and the lid comprising: a peripheral skirt comprising a circular part from which an outwardly flared part depends, the circular part of the peripheral skirt sealingly engaging with the circular rim, the outwardly flared depending part of the peripheral skirt not being in contact with and being spaced away from any part of the container; at least a region having thermochromic properties which is adapted to change color upon reaching a predetermined heated non-ambient temperature in response to heat transfer from or to the contents of the container; and thermochromic material applied either to all of the lid including the skirt, or only to the skirt, to provide the thermochromic properties whereby the color of the skirt provides a visual indication as to whether or not the lid is properly sealed with respect to the beverage container.