HP ink cartridges use a chip technology to sense when they are low on ink and advise the user to make a change. But the suit claims those chips also shut down the cartridges at a predetermined date regardless of whether they are empty.Source: Yahoo! News
So HP ink has a shelf life? It would be interesting to contact a number of retail locations and see what they say. I only buy HP printers, and I have never had a case like this.