Nokia may have sold its handset business to Microsoft Corp, but by hanging on to its valuable patent portfolio, the Finnish company could also get a big future payoff at the expense of Android phone makers.

Microsoft agreed on Tuesday to pay 3.79 billion euros ($5 billion) for Nokia’s handset business and another 1.65 billion euros for a 10-year license for Nokia’s patents, considered some of the highest-quality patents in the mobile market.