When has a university ever sued someone? Patents generally end up being bought by companies using them... Unless shenanigans are at play.
Here's an article from Stanford law school: 'Are universities the new patent trolls?' http://papers.ssrn.com/sol3/papers.cfm?abstract_id=980776
Universities often (and unfairly IMHO) claim rights on graduate research precisely to monetize and act as patent gatekeepers.
(My impression is that UW is fairly extreme in this regard)