Research is permitted, if the protected invention is commercially available, as far as I know. E.g. medical research. I believe, this means use for research cannot be restricted once commercially available. I am not sure, if it's limited to medicine in Germany. The US has similar exceptions for medical research AFAIK.

Sadly there is indeed no blanket permission for public research and education in Germany, either. There is little point mentioning it, but HN rate-limited my account, so I couldn't edit or comment to clarify in time.

I am not advocating for the German patent system, I just think the US is particularly ridiculous prohibiting personal reproduction and use. Like, you got a lathe, lab, computer or 3D printer and are literally prohibited to use it as you please, not allowed create certain mechanisms, substances, shapes and functions, for your own use, or even survival, without (possibly) harming anyone else.