A lid for a cooking vessel includes a substantially planar member, a raised periphery and a beveled portion. The substantially planar member has top and bottom surfaces and at least one opening formed therein proximate an edge thereof. The beveled portion is coupled to the edge of the substantially planar...http://www.google.es/patents/US6029843?utm_source=gb-gplus-sharePatente US6029843 - Cookware lid
