I used to work for a major research university. We did Federal contract and grant research. Believe me, those researchers got every patent they could and would have disappeared overnight if anyone had told them they couldn't. It just depends on the terms of your agreement when you take the job. Ivins worked at a research institute. He patented two vaccines while he was there, and he received royalties from them.
I know contractors are corrupt.
I also know pretty much what the federal standards are for researchers who "get a patent" regarding stuff they worked on.
No, Ivins was not likely going to sell his patent rights ~ since it's just a perfunctory assignment of rights to meet the constitutional standard.
And he didn't mail the letters.
You really need to catch up on the last 10 years of discussion of this issue.