Good questions Tred - Some of the patents have quite a bit of back and forth messaging between Anavex and the patent office which can go on for months.
The tab "transaction history" shows the back and forth dialog and the "image file wrapper" tab gives the details - it's pretty interesting(to me).
As to the inventors I'm guessing Anavex sometimes pays other parties to do the research and apply for the patents with Anavex being the owner. Probably someone else could provide a different view but that's just my thoughts. fwiw