Why can't Nintendo just sue Sony for imitation?

[ssj12]

Bamboleo said:

If Apple can sue HTC for 20 iPhone patents infringment (http://www.apple.com/pr/library/2010/03/02patents.html ) there is something that Nintendo can't do.

All this imitation can't just be created and launched just like that.

For an instance I just hate Nintendo to be so dumb about their creations and not taking the necessary measures to prevent blatant copy.

I for one, can see Apple thrown out of court and have their patents stripped from them.