A pharmaceutical mixing container for storing a liquid having at least two factions which tend to separate during storage. A housing has an inner volume and is closed at one end by a septum arrangement and at another end by a slidable sealing member. A buoyant member is located within the housing and...http://www.google.com.au/patents/US5246670?utm_source=gb-gplus-sharePatent US5246670 - Pharmaceutical mixing container with buoyant mixing element
