I think the key word there is "limited times", which someone could argue that 140 years (even 110) is no longer limited, but "unlimited" for the authors/invento

I think the key word there is "limited times", which someone could argue that 140 years (even 110) is no longer limited, but "unlimited" for the authors/inventors lifetime. I do agree that copyright could last longer than patents, although the current laws are made to grant copyright for many (~6) generations, while patents are for only ~1 (all depends what you call a generation, I estimated at 20-25 years).