Patent ID: 9567200
Date: 2017-02-14
CPC Classifications: B65D,B67D,C12C

Claim:
1. A vented keg closure for use with a keg containing a fermenting beverage, the closure comprising a filter member disposed within an airway of the closure, the airway being arranged to communicate between an internal headspace of the keg and an environment external to the keg, the closure having: a first configuration allowing venting of gaseous products of fermentation and in which the filter member is located at a first position at which it filters a majority of the gas flowing through the airway; and a second configuration wherein the filter member is located at a second position at which gas flow through the airway can be increased by at least partially bypassing the filter; wherein an extent of movement between the first and second configurations is controlled by the gas pressure difference across the airway.