Disclosed herein is a cup permitting easy drinking-up of its liquid content. The cylindrical side wall of the cup is composed of a thin-walled material having suitable degrees of flexibility and elasticity, and a number of bellows-like corrugations are provided in the cylindrical side wall in such a...http://www.google.es/patents/US4609113?utm_source=gb-gplus-sharePatente US4609113 - Cup permitting easy drinking-up
