"Amiga" patents - what are they?

[Iggy]

At almost 25 years old, the question becomes are these patents still valid? If so could they be used as ammunition against current Amiga clone projects (like the Natami or Jens Schönfeld's project)?

[Iggy]

20 years patent lifetime, right?

Then the patents are not a restriction (they might be useful as technical reference material). The only real restriction becomes the copyrighted intellectual property (Kickstart, AOS, etc.).
So, is there a way to uncover the details of a old patent?

[Iggy]

Hmm...I don't really care so much about the legal status or whether or not I'm allowed to use the patents, since I'm not at all considering cloning/building anything.

This is just plain curiosity. (Maybe the exact details are not out there in the public since it really is worth nada - while Amiga Inc. is pretending they are sitting on gold.)

I can understand your curiosity (if available, the patents might lead to a clearer understanding of the Amiga's hardware and software systems).
As to Amiga Inc (and in particular Bill McEwan), I take any statements they make with a grain of salt. Amiga Anywhere seems rather pointless. Legal battles over Amiga OS4.x have hampered the development of future Amiga systems. Amiga OS5? No doubt, that's not going to happen unless they get the source to 4.0 (and then they'll probably be relying on their India subsidiary to create 5.0).
Frankly, even if their intellectual property has residual value, the longer they sit on it without developing it, the lower that value becomes.