The present invention provides a lid 1 for a beverage cup. The lid 1 has a generally annular side wall 6, a rib 7 depending from the side wall 6, and a top wall 5 extending radially inward from the side wall 6. The lid 1 further includes a central region 4 positioned radially inward of the top wall 5....http://www.google.es/patents/US6874649?utm_source=gb-gplus-sharePatente US6874649 - Lid
