Amiga Inc never held any Amigs patents, Gateway (now acer) did, I don't think there was sufficient change to the original chipset to warrent anything patentable in the AGA chipset (AGA is just a slight improvement to the Amiga design), and the last Amiga patent to expire was one relating to the right mouse button... And that went a few years ago.
There were a few more old C= patents beyond the right mouse button patent. Since C= went in 1994, I would expect 2014 to be the last possible year of old C= patents to be active.
Dammy
