A cap and container assembly can be opened and closed repeatedly and continue to achieve a good seal between the cap and the container. The good seal results from the engagement, of the container neck with cap protrusions, which temporarily deforms the shape of the container and/or the cap as the cap...http://www.google.com.au/patents/US6260722?utm_source=gb-gplus-sharePatent US6260722 - Cap and container assembly
