Over the last eight years the U.S. International Trade Commission has weathered a big uptick in patent challenges related to mobile technology, attacks on its ability to hear complaints brought by so-called non-practicing entities, and an eventual decline in new patent cases. All the while patent licensing company InterDigital Inc. has plowed ahead with an ITC case it brought in 2007 against Nokia Inc. and Microsoft Corp.-and now it's finally won a key ruling from an ITC judge.