Ann: Notice of General Meeting/Proxy Form, page-71

Hi Pixi, it looks like the patents cover combinations containing PBT2. Composition of matter may give them some coverage for other uses, but not sure.

[The United States Patent and Trademark Office (USPTO) has Granted a composition of matter patent for selected 8-hydroxyquinoline compounds, including its lead clinical asset, PBT2, in the United States. The patent titled '8-Hydroxyquinoline derivatives' also covers pharmaceutical compositions containing PBT2 and selected 8-hydroxyquinoline compounds.]

https://money.cnn.com/news/newsfeeds/articles/marketwire/0654817.htm