In thinking some more about this, maybe it isn't a surprise that it was "lost" in the shuffle to come up with something for HIV. If you think back to that period that was the focus of about any researcher who was linked to the issue of AIDS in some way. Why not go after that instead of psoriasis - probably an easy choice. You might just end up with a Nobel Prize. But I still think it is amazing that no one ever returned to pursue it.
Maybe we should all take up perusing expired patents for forgotten gems. Reminds me of an article I read the other day on rare earth elements. All these electronics etc. need them and they are in short supply worldwide. So the U.S. government starting looking at discarded rubble from old mining sites. At one in Nevada the discard was full of Indium because the miners didn't care about it and wanted silver or copper or something. Makes you wonder how much rubble is in the old patents. Now if they were only easier to read...
Just to clarify, given that psoriasis was contemplated in the old patent as a medical use how is that not a problem for CTIX. It would seem to make patenting the molecule for use on psoriasis would come under prior art / obviousness since somebody had already shown the molecule treats psoriasis in a patent. I'm sure I am missing something but can this just be clarified. How is CTIX getting around this issue?