Up until now, it has not been possible to store and offer Argon in a can. A clever new valve, prevents the argon from escaping the can. Argon is far denser than Nitrogen and cannot dissolve into the wine in the bottle over time. It creates an inert heavy seal over the wine. The sooner you use it once you have opened the bottle, the longer the remaining wine will last.
Find out more here: www.winesave.com
Read more about preserving an open bottle here: How to preserve an open bottle of wine
Read what Jancis Robinson has to say about WineSave - Small sips to be allowed at last, 5 Jan 2011
Decanter - Finally, a Way to Save Wine