Originally, the Oracle lawsuit had some patent claims in it, IIRC. They were thrown out though. I can't recall if they were thrown out by the judge or if Google spent the time/money/lawyers to get them invalidated.

Any open source language, even those not affiliated with a company, could be vulnerable to that though.

Now, in this particular case (for those who can digest legalease): http://golang.org/PATENTS

IANAL, I don't think that's true for the Apache license, because it includes a clause that explicitly reassigns patents (or at least licenses any relevant patents).