A closure for a liquid container comprising a base including a conduit extending therethrough, the base further including a substantially tubular spout guide and a plug positioned radially within the tubular spout guide, and a substantially annular spout mounted to the tubular spout guide for reciprocation...http://www.google.de/patents/US7143911?utm_source=gb-gplus-sharePatent US7143911 - Beverage closure with open/close spout and protected seal surfaces
