I don't recall seeing patents in any of my alerts. I have a few hundred on different topics/keywords, some of which definitely show up in patents. I could just be wrong, but it's possible that they are filtering out their patent search results.
I just tried adding the word "patent" to a search, and the top results returned were kind of relevant, but you're right, not direct patent links. Mostly news, but also a decent hit on a site called FreshPatents.com, which may be the service you are looking for.
